• I think I sussed it from googling around - shimano 10sp cassette on an 11sp freehub needs 1.85mm + 1mm spacer. I only had a 1mm spacer on there (which was how the shimano cassette I'd taken off was setup by my shop), threw in another 1mm spacer I had lying around and it tighted up significantly, with only minimal play left. so just need to order a 1.85mm spacer to replace the temporary 1mm I'd put in

    here's hoping I didn't fsck up the chain sizing. used the equation method

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