NCM_0194 1 (2).jpgI just bought the cheap HF chisel set and welded a washer for good measure probably didn't need to since it cut the sharp end off and deburred it ,drilled the UHMW a little undersize and put the bit in the zip gun and drove it in made sure there was over an inch left of UHMW will take awhile to beat thru and cheap enough to start again