I have what I think is a decent used MC21 crank except for the fact that it is missing the center o-ring (part # 91301-KV3-771)! Assuming I can get this part (a big assumption) or a matching substitute (a smaller, but still significant assumption), does anyone know if the O-ring can be installed without taking the crank apart, i.e., is it possible to stretch the O-ring enough to fit it on in the middle without breaking it or otherwise weakening it? Thanks for any help.
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-Jim
'93 MC21