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Record EC34 AHead? Apparently 5/32" upper and 3/16" lower. You can still get the genuine caged sets for about £15, but there's nothing wrong with using loose balls if you can be bothered with the fiddly assembly.
gbj_tester-
@gbj_tester Got a selection off eBay - not the highest quality but at least I'll have spares!
Vince
I have a set of Facom vernier gauges which are not the most precise.
The to upper bearings were about 4mm while the lower bearing were about 5mm.
So from what I measured I think they are 3/16" / 0.187 = 4.76mm