Campag pista vintage crank

ISO/J.I.S. Interchangeability
[INDENT] If you install an ISO crank on a J.I.S. spindle, **it will sit about 4.5 mm farther out than it would on an ISO spindle ***of the same length.* Confersely, if you install a J.I.S. crank on an ISO spindle, it will wind up about 4.5 mm farther in than it would on a J.I.S spindle of the same length.
Theoretically, ISO cranks should only be used on ISO spindles, and J.I.S. cranks only on J.I.S. spindles.

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Sheldon has your back. You've gt the wrong taper on your BB spindle.