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@deleted
crown races used on other crowns may fit as the other crown may have been to big for the crown race, thus stretching it. A difference of 0.05mm-0.15mm is what you should have, smaller and it will be too loose, bigger and it will be too tight, thus risking damaging the crown race.
the ISO inside diameter of a 1" crown race is 26.4mm, 27.0mm for JIS