Deejay, from Joe's post in this thread I take it his puller uses self-threading bolts. These are hardened and have a longitudinal groove cut into the first half dozen or so threads, to act as a sort of tap. The actual Briggs design for my puller has the same self-threading bolts. I made my puller out of stuff from the junkbox, which didn't include the right bolts, so I used what I had.
