"David Martin" wrote:

michael adams wrote:

Bottom bracket axles can't shorten. What's hapened presumably
is that the bottom bracket cartridge has rotated on the threads
inside the shell and moved across.

If the above is total nonsense, then presumably it will be corrected
in short order.

It is nonsense. The crank side is the fixed cup and is tightened up
completely. Undoing this will move the crank out, not in.

Shimano have made cartridge bottom brackets that insert from the left
(non-drive side). Ben's BB-CT90 is one of those:

http://bernd.sluka.de/Fahrrad/Shiman...-CT90_1995.gif

So it seems likely that Michael is correct.

James Thomson