Thomas Adams asked:
Could anyone shed some light on what might have caused the groove seen on this bottom bracket shell?
or ebay item # 7187890283, and blow up the pic of the BB shell.
Any speculation on whether the BB shell is usable as it is, or would repair/replacement be necessary? If it's repairable, what would need to be done? +++++++++++++++++++++++++ I have no idea what caused it, but, looking carefully at the most enlarged view, I think I see:
1) Seems not to be cut all the way through, which would interrupt the the threading. This means it won't be too frustrating to thread BB cup into it.
2) Phil BB has been installed. About 2 threads show, of roughly 9 - 10 (if memory serves). This suggests to me that the spindle is still well supported, even for gentlemen of substantial gravitas.
3) If I'm wrong, I don't think this is a frame that I'd put a lot into saving (maybe slide in a modern cartridge unit with longer cup threading). Note the chainstay bridge, which seems to be crudely seamed tubing, in the same picture. Just a little pence-saver step.
As I say, I could be wrong.
harvey sachs
McLean VA