Tapered leads are a pain, i really prefer to use cylindrical leads. One can buy cylindrical leads, but I'm too cheap to spring for them, as they are about 5 times the cost of supply house cheap tapered leads. I've tried a bunch of ways to make a cylindrical lead out of the tapered leads, but none of them worked very well, until I came up with this simple solution. Buy a slightly undersized drill bushing, for example for 3/8" leads, drill a 3/8" hole with a forstener bit, and use a 9.4mm ( Mcmaster 96977A343) drill bushing to form the lead. For a 1/2" hole, use 12.6mm (ID) drill bushing. Grind a 3/8 and 1/2" rod respectively, so it fits in the undersized drill bushings.
To form the lead, place the lead in the bushing tapered side up, put the bushing and lead on an anvil, smoosh the lead inside the drill bushing, and the eject the cylindrical lead using a small arbor press. It took me 20 minutes to do 1lb.Grind the bushing end on a belt sander or something so there is no chamfer in the bottom end of the bushing. These fit with just a few thousandths clearance, and require only a light swage to install, not clicking around.
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