Originally Posted by
jackbombay
As for the threads, the BB shell is 26TPI and anything square taper is 24 TPI, I have some old steel cups that I cut notches into the threads of and I screw them in and out of the BB shell repeatedly and it works quite well, I actually use a large drill to run my "taps" in and out repeatedly.
jackbombay I missed what you were saying here the first time I read it. So you use an old 24tpi cup as a die to recut the threads? I'd have assumed that would just result in destroying the threads on both the cup and the BB, but interesting to hear that it's worked reliably for you. Could you post a picture of your thread cutting cup?