I found the instruction
http://www.securon.co.uk/fitting/extras/500fitting.htm
Yes - the crank has never been ground! I measured 41.28 mm with vernier calipers. To be on the safe side, I ordered a micrometer.philthehill wrote: ↑Tue May 23, 2023 8:37 am I assume that you have measured the crank journals and they are serviceable and within the wear limit?