unterhausen , thanks for responding. I'm afraid you're right. It looks like there is a crack in the paint over most of the circumference of the ST where it enters the BB shell. I assume this would occur from the tube moving independently of the shell...?
NDS from rear
DS from rear
DS straight on
What would be the next step here? What would a framebuilder do to confirm damage? Removing the cartridge for an inside look seems like a smart idea. What about removing paint from the area?
I'm struggling to understand what is happening. Is it the case that the ST is still intact but just sliding within the BB shell? Or is the ST itself cracked?
Thanks,
Oliver H.