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The answer is it depends on the configuration of the current through bolt with regard to thread length etc. The recessed nut may come to the end of the thread before the caliper is tight or the bolt may protrude through the recessed nut so that the hex key can no longer be used to tighten it.
Botttom line is measure everything before you drill the frame to ensure that things fit. -
Difficult to drill the rear, as the seat tube gets in the way.
Easier to mount a second front brake, backwards; ie on the front of the brake bridge, facing the "wrong" way.
More info here (scroll down to "Mounting recessed-mounting calipers on older frames".
freezing77
Scilly.Suffolk
@TPR
thanks,
with the rear, could I just enlarge the rear brake hole on the frame and then put in a recessed nut?
sorry for newbish questions