Originally Posted by disston
Some cranks have larger throws or some spigots are deeper. In some applications a small notch or little bit of grinding needs to be done to clear. I'll try to find the info about which swap runs into this problem. I don't think it is even a rare problem.
Disston, every airhead crank from an R50/5 to an R100RS has the same stroke/throw. They're all the same.
Only ones that are different are the R65/45 cranks, but we're not talking about those here.