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Whilst fighting to remove some old bearings from my norco I have take apart the bike and found a tiny hole where the disc brake screws into the frame . It looks to me like its where's the bolt itself goes in.
What do you think? Fatal? Ok and normal?
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Too long a bolt has been fitted at some point. Done the same to a set of forks i didnt die.
I'd say you'd bottomed a bolt out in the thread part of the mount and broken through.
I'd not worry but make sure you grease the bolt so it doesn't sieze.