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As I understand it the flat mount fork has no threads - the bolts are fed through from the front and screw in to threads on a mounting plate, on which the caliper is then bolted.
Or maybe not, I dunno, at least it looks like the caliper is bolted to something rather than directly to the fork.
It's a bit of a mess but then it's better than PM in the context of the not fucking up your fork discussion.
How does flat mount remove the risk of fucking up the fork? Aren't you still just bolting a caliper to a fork?