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  • Interestingly I had an issue with a shimano rotor a few months ago, I nearly rewelded the bosses on a frame until I thought to try a different rotor first. It was over a mm too long, have no idea how it had happened. Was for @Dammit so I just turned it down, but maybe meaure the rotor centre lock depth from rotor centre before burning anyhting ;)

  • Not much, and nothing worth worrying about particularly if you're wearing safety specs. It doesn't weigh very much, so if it does come off there's not much energy to dissipate. Spinning big heavy things in a lathe is far more dangerous if they come loose.

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