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@edmundane
i'm somehow quite sure this is the case here... but then if you put a JIS crank on ISO BB the spindle will stick out too much you won't really be able to tighten the cranks properly.
and if the BB is the original that came with the bike since it rolled out of the factory 20+ years ago it must be ISO.
what cranks you using? it's definitely worth swapping out the BB for one that'll fit properly.