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Modern QR axles are just that fraction thicker
No they aren't. Your old axle has probably worn down a bit, and your dropouts have closed up a bit. Or maybe if you have a modern wheel with plain axle ends, they are actually 10mm but your old M10 threaded axle was always a bit under 10mm, because that's just how threads work. It probably doesn't help that a 7-speed UG road hub was 126mm OLN and a 10-speed wheel will be 130mm.
Is it me, or are bike parts trying to say "please, please, no"?
Have received a pair of 10 speed wheels as hand-me-downs, with a lot of use but a lot of life left. My current 7 speed wheelset (on the daily bike) is battered, and certainly need new rims as a minimum. However, free wheels.
Old wheelset has uniglide TT cassette, and I only have one chainwhip handy. So, built up a nice narrow range cassette with loose sprockets, and extra spacers to make up the difference in freehub size.
Tried the back wheel. Modern QR axles are just that fraction thicker. Annoying, but at least the wheel will seat okay-ish. Not deep in the dropout, but not dangerously on the edge. Will look again tomorrow when I try the front too. Hopefully it's not a bust.
Not sure I want to file away at the frame, but maybe the solution.