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its trickier if the thing you're drilling isn't flat
The best approach is to make it flat before you drill it, by milling a spot face.
gbj_tester-
See, this is what I assumed would be the way to go, I just don’t think I have the capability to do that. Is there a bodgy way to do that with a clamp and a hand held drill?
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True. I meant more that if you lay the forks down they won't be in the perfect position to drill the brake hole. So you'd have to line up and clamp. Rather than a flat piece of wood or sheet metal where you just plonk it on the the drill table and go for it.
AlexD
tallsam
I reckon you need to file the washer so it can sit slightly over those tubes (ie move the circles up a few mm).
Also there are ways of drilling straight holes without a drill press but its trickier if the thing you're drilling isn't flat, which this isn't. But then its also hard to drill straight holes on non-flat things with a drill press. Clamping is everything.