Originally Posted by
JackJohn
Thanks guys! Yes, I can make a chaser if the bb shell is not too damaged, as said I tested another bb cup and worked fine, hence my puzzling, if the the shell was damaged that wouldn’t have worked.
In the end, my aim is to understand if I can still use that Campy bb cup or if the risk of damaging the frame shell is high, from my experiment above it’s not clear, your answers are clearer on that
oneclick in point c) do you mean completely removing the damaged threads and have a flat surface instead? Will the cup have enough threads to hold tight?
I would suggest trying a thread restoring file before more drastic measures like cutting the existing cup into a thread chaser (a chaser is not a tap or die, it's more of a cleaner than a cutter.) or grinding threads. Mainly because my hand skills are better than my machine tool skills, and I'm 99.9% sure I can do a lot less damage with a hand tool than with a cutting machine or a serious cutting tool, and 100% sure I can make those threads rather clearer and straighter with the thread restoring file.