Editorial Note for 2010202857 There is one description page FISHING LINE SINKER Field of the Invention This invention relates to a fishing line sinker and a method of securing a fishing line to a fishing line sinker. 5 Background of the Invention Existing sinkers generally have a bore extending through the body of the sinker for receiving the fishing line. In order to change a sinker, typically of a different size and weight, it was necessary to cut the fishing line, remove the old sinker, retie hook to the end of the line and then apply the new sinker. This process not only wasted fishing line 10 but took excess time to change the sinker, time that could have been used to do fishing, The present invention seeks to overcome one or more of the above disadvantages by providing an improved fishing line sinker. Summary of the Invention According to a first aspect of the invention there is provided a fishing line sinker 15 including an outer body having a bore therethrough, a slit extending the full length of the body from the bore to a periphery of the body and a pair of diametrically opposed keyways extending from the periphery of the bore, the bore being tapered from one end of the bore to the other end of the bore; a locking pin having a first end and a second end with a tapered body extending from the first end to the second end, such that the diameter 20 of the first end of the locking pin is larger than the diameter of the second end of the locking pin, the locking pin adapted to fit within the bore of the outer body with the tapered body of the locking pin making a corresponding fit to the tapered bore to provide a secure engagement between the locking pin and the outer body; the locking pin further including a pair of opposed keys external to the body of the locking pin, and a slit 25 extending from the first end to the second end and from substantially the centre of the locking pin to the periphery of the locking pin; wherein in order to secure the sinker to a fishing line, the fishing line extends through each of the locking pin slit and the outer body slit, the locking pin is placed within the bore of the outer body such that the opposed keys of the locking pin fit into a respective keyway of the opposed keyways of 30 the outer body to thereby secure the fishing line between the locking pin and the outer body. According to a second aspect of the invention there is provided a method of securing a fishing line to a fishing line sinker, the fishing line sinker having an outer 2 body having a bore therethrough, a slit extending the full length of the body from the bore to a periphery of the body and a pair of diametrically opposed keyways extending from the periphery of the bore, the bore being tapered from one end of the bore to the other end of the bore; a locking pin having a first end and a second end with a tapered 5 body extending from the first end to the second end, such that the diameter of the first end of the locking pin is larger than the diameter of the second end of the locking pin, the locking pin adapted to fit within the bore of the outer body with the tapered body of the locking pin making a corresponding fit to the tapered bore to provide a secure engagement between the locking pin and the outer body; the locking pin further including 10 a pair of opposed keys external to the body of the locking pin, and a slit extending from the first end to the second end and from substantially the centre of the locking pin to the periphery of the locking pin; and the method including the steps of placing the fishing through the slit of the outer body and into the bore of the outer body; placing the fishing line through the slit of the locking pin; inserting the locking pin into the bore of the outer 15 body; and inserting the keys of the locking pin into respective keyways of the outer body such that the fishing line is secured between the locking pin and the outer body. Preferably the pair of opposed keyways are substantially orthogonal to the slit of the outer body. Preferably the slit of the outer body is substantially opposite the slit of the looking pin when the fishing line and sinker are in use. 20 Preferably in order to remove the fishing line from the sinker, the locking pin is moved outwardly of the outer body in the direction of increasing taper of the locking pin until either the slits of the respective outer body and locking pin align or the locking pin is clear of the outer body. Preferably the locking pin includes a flange at the first end where the flange abuts 25 against the surface of the outer body. Brief Description of the Drawings Preferred embodiments of the invention will hereinafter be described, by way of example only, with reference to the Figures in which: Figure 1 is a perspective view of a fishing line sinker having an outer body and 30 locking pin inserted through a bore and showing a slit in the locking pin aligned with a slit in the outer body; Figure 2 is a perspective view of the locking pin of the fishing line sinker having a pair of keys that extend either side of a tapering body of the locking pin; 3 Figure 3 is a perspective view of the locking pin shown fitted to the outer body with the slit of the locking pin opposed to the slit of the outer body, with the fishing line protruding therethrough and in the locked position; Figure 4 is a perspective view of the outer body showing the bore and slit of the 5 outer body with a pair of keyways extending oppositely from one another at the periphery of the bore; Figure 5 is a side sectional view taken along the line A-A in Figure 8 and showing the bore of the outer body and keyways of the outer body; Figure 6 is a sectional view taken along the line A-A in Figure 8 showing the 10 locking pin fitted to the outer body; Figure 7 is a front view of Figure 1 showing a fishing line extending through the slits of the locking pin and outer body; Figure 8 is a side view of the sinker of Figure 1; Figure 9 is a top view of the outer body of Figure 4; 15 Figure 10 is a bottom view showing the outer body and locking pin having respective slits aligned; Figure 11 is a bottom view of the locking pin and a pair of opposed keys either side of the slit of the locking pin; Figure 12 is a right side view of the locking pin showing a tapering key along the 20 tapering body of the locking pin; Figure 13 is a front view of the locking pin of Figure 2 showing a pair of opposed keys; and Figure 14 is a sectional view along line B-B of Figure 12 of the locking pin. Detailed Description of the Preferred Fmbodiments 25 With reference to Figure 1 there is shown a fishing line sinker (1) comprising an outer body (4) and a locking pin (2) shown fitted within the outer body (4). A slit (3) in the outer body (4) extends from a central bore (11) (see Figure 4) to the periphery of the outer body. Referring to Figure 2 there is shown the locking pin (2) having a first end (5) and 30 a second end (6), each of which are joined by a tapering body (7), which tapers from the first end (5) to the second end (6). Diametrically opposed and following the taper of the body (7) of the locking pin (2) are a pair of keys (15). The locking pin (2) also has a slit 4 (8) which extends from a central bore (12) in the locking pin (2) to a periphery of the locking pin (2). In Figure 3 there is shown a fishing line (9) protruding through the locking pin (2) and the outer body (4). s Referring to Figure 4 a pair of keyways (10) are diametrically opposed on the periphery of the bore (11) and extend along the entire length of the bore (11) as is more clearly seen in Figure 5. In Figure 6 there is shown a flange (14) at the first end (5) of the locking pin (2) which abuts a top surface of the outer body (4). The top surface and a bottom surface of 10 the outer body (4) can be made flat as is shown in Figure 5. Figure 5 also shows the bore (11) tapering from the top to the bottom of the outer body (4). The body of the locking pin (2) is also tapered to match the tapered bore (11) so that an interference fit can be made to securely fit the locking pin (2) to the outer body (4) as is shown in Figure 6. Alternatively or additionally a flange (16) can be located at the bottom second end (6) of 15 the locking pin (2). In order to attach a new sinker to the fishing line, the fishing line is initially placed through slit (3) of the outer body (4) to be resident in the central bore (11). The locking pin (2) has its slit (8) placed on the fishing line (9) so that the fishing line (9) resides within the slit (8). The locking pin (2) is then placed in the bore (11) and can be 20 rotated a half turn either clockwise or anti-clockwise so that the slit (8) is directly opposed to the slit (3), This retains the fishing line (9) within the sinker (1). Alternatively the fishing line (9) can be placed in the slit (8) of the locking pin (2) with locking pin (2) positioned above the outer body (4) and then rotated so that the slit (8) is diametrically opposed to the slit (3) and then the locking pin (2) is pushed firmly 25 downwardly into the bore (11) so that the opposing keys (15) line up and interference fit with corresponding keyways (10). The keyways (10) engaging with the keys (15) ensure that there is no further movement of the locking pin (2) with respect to the outer body (4) and that the fishing line (9) cannot come apart from the sinker (1). In order to remove the fishing line (9) from the sinker (1) and replace or change 30 the sinker, the locking pin (2) is forced upwardly usually from the bottom or by gripping the top flange (14) so that it comes adrift entirely from the outer body (4). Alternatively once the locking pin (2) is gripped it can be rotated a half turn so that the slits (8, 3) align and the fishing line (9) can be removed from the sinker (1). 5 Shown in Figure 9 is a top view of the outer body (4) showing the keyways (10) and the slit (3). Figure 10 shows the locking pin (2) fitted within the outer body (4) in the centre with the respective slits aligned. Figure 11 is a bottom view of the locking pin (2) while Figure 12 is a side view of the looking pin (2) showing one of the keys (15) 5 which tapers from the top to the bottom or from the first end (5) to the second end (6) of the looking pin (2). The tapering assists in wedging the locking pin (2) into the keyways (10). Thus, each key (15) starts with a wide portion at the top and gradually narrows down to almost a point at the bottom of the locking pin (2). Figures 13 and 14 respectively show a front view of the locking pin (2) with both 10 keys (15) and a sectional view of the locking pin (2) with the gap or slit (8) extending from the top to the bottom of the locking pin (2). It is seen that this invention provides a fishing split sinker which can be applied to a fishing line whilst the fishing rod remains fully assembled with a hook, stopper and any other accessories. The sinkers can be made from stainless steel and this is preferable to is existing lead sinkers which can be detrimental to the environment in which the sinker is used. The split sinker is very simple to apply to a fishing line, with the body of the sinker having a slit through the centre, and a locking pin also having a slit through it in order to apply the sinker to the fishing line. In order to assemble, the fishing line is slid through the sinker and the locking pin 20 making sure that the two parts are in line and then pushing the locking pin down into the sinker until both parts are locked allowing the fishing line to move freely within the sinker. This is a simple two-step process to change sinkers without tangling the line. The split sinker and locking pin have slits through both parts so that one can slide a fishing line into the body of the sinker. To assemble the sinker on the fishing line, the 25 line is slid through the sinker to the centre, and also with the locking pin, this is turned half clockwise and then the pin is pushed down inside the body of the sinker until both parts are locked securely together so that the sinker can slide freely on the line. To remove the sinker, one just pushes the locking pin out and the line is free. When bait fishing at night and the sinker requires changing to a different size, the 30 split sinker will not tangle the fishing line. As mentioned previously, the splits sinkers are preferably made from stainless steel. With the old lead sinkers one had to feed the fishing line through the sinker, push it up the line to tie the stopper on then to tie the hook onto the line. When one needed to change to a different size sinker, one had to strip the 6 fishing line and repeat the same process again. With the new split sinker according to this invention, one can leave the hook and stopper on as it is, The split sinkers can be used in fresh water or salt water and are environmentally friendly, will not rust or corrode. The split sinker is easy and efficient to apply to a fishing line whilst a fishing 5 rod is fully assembled. 7