I think I got them the right way round Ed, longer one on brake side, shorter one gear change side.Re: What Bill has said and most unlikely but the spacers left and right, F51/4 and F51/5 are different lengths. Is it possible you have a left spacer fitted on the right. The left spacer has a cut away portin on the large diameter end to clear the primary chaincase. As I said, unlikely but a maybe.
Cheers
Dave