Undersize BB shell

By the way, one further small snag (surely not the last) was that when I came to install the new BB, I discovered that the shell was in fact only about 65mm, rather than the standard 68mm. Of course with the old adjustable 3-piece cup & cone bearings, this was easy enough to accommodate, but with unadjustable cartridge bearings it simply didn't fit. So now I have the old BB lock-ring serving as a spacer. Perfect!