without being wrapped around the center portion 13 the sinker will function as a slip sinker that permits a fish taking a bait or lure to pull out line 2 without significant resistance from the line passing through the bores and over the center portion 13 although the locations of the sinker 5 on the line 2 are essentially unlimited only one knot is required in the embodiment shown in fig4 a resilient o ring 32 encircles the reduced center portion 13 in gripping contact therewith the line segment 31 is not wrapped around the center portion 13 but instead is threaded under the o ring between the bore ends 26 and 29 the frictional contact of the o ring pressing the segment 31 against the center portion 13 will hold the sinker in any predetermined location on the line 2 to adjust or change the location of the sinker 5 it is merely necessary to pull the line through the o ring 32 also when the sinker 5 has been rigged as a slip sinker but it is later realized that the sinker must be held immovable on the line 2 the sinker and line can be threaded into an o ring 32 as shown in fig4 this will convert the slip sinker rig into a fixed sinker rig without requiring the tying or untying of any additional knots the body of sinker 5 may be molded from any non soluble material that is dense enough to sink in water when the material is.