You can buy cassettes that will fit on campag freehubs with shimano spacing. Fairly niche though
I'd hoped I could just get the spacers to alternately space the cassettes I already have, but thanks for that reminder about the shiftmate thingy.
Most cassettes have the first 3 or so cogs as a single piece so you couldn’t swap the spacers between them. Maybe on some cassettes you could but I wouldn’t imagine it’s something available to buy.
@Brazelephantman started
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You can buy cassettes that will fit on campag freehubs with shimano spacing. Fairly niche though