someone wrote, in part:
It's the odd 108mm length of the "later" (~1980's) Superbe and Sprint spindles, in Campy ISO taper size (same 2-degree taper angle as JIS) that makes these spindles unique and, as a long-obsolete wear part, hard to find.
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superbe cranks will go on campagnolo spindles in a pinch...the Suntour crank that's the real oddball is the early 80s iteration of the Suntour cyclone crank. Far as I can tell, from direct, and deeply frustrating experience, those cranks work ONLY with certain very specific Suntour spindles..
Charles "love the crank, hate the designer" Andrews Los Angeles