Just curious. What is the advantage to the undersized tap. I didn't use radial pins for a long time. Last year I had an order for a cue with radial so I figured why the hell not offer them. So I bought 50 from Tom. Flat top radials. Now I knew there were issues from reading about knockoffs and different taps Ect. So I called atlas and the guy said don't even bother with the undersized just use the normal for all applications. So I just got the regular tap. It's plenty tight on the shaft end.
Nothing is worse then a shaft that is too tight when screwed on. I want to play pool not wrestle.