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why you simply wouldn’t just drill both front and rear out to 8mm
You want to leave enough 6mm hole on the caliper side to stop it flapping about. That means you have to drill from inside the rear triangle, which is tricky, and you might not have enough metal to do it anyway, that top hat inserted into the bridge can be quite thin walled
Ah so that’s what that meant! Thank you, I didn’t think that was a viable solution at the time.
Is there a reason why you simply wouldn’t just drill both front and rear out to 8mm, though? I reckon there’s enough metal on the rear brake bridge at any rate.