That's actually an example of how I came by my 'username' on here. Someone posted about drilling out a rear brake bridge to fit a modern caliper with a 'sleeve nut' to an old Raleigh* and I passed on a tip I'd been given, if you use that on the rear and simply fit a suitable sized 'nylock' nut then you don't need to drill the back out to fit the 'sleeve nut'
* the Raleigh in question had a thin tube as a brake bridge and to drill it to 10mm to fit would have left it dangerously thin, this trick also works on other brands of vintage bikes too.