Originally Posted by
Salamandrine
Early on, the top end "Mighty" Sugino cranks were designed to be interchangeable with Campagnolo. This continued up to around the mid 80s, IIRC. A Mighty from the 70s up until the early 80s should fit your campy spindle fine, after that it gets a bit dicey. Any way you slice it, try and fit will be required.
Again, there were n't JIS and ISO tapers during this period. That standard was established later.
this might indicate that an early Mighty Tour might be a solution, if i can find one of those lying around...