Bobby -- I purchased some plastic replacement brake wheels a while ago and just measured the shaft diameter to be 3/64". That might be a bit smaller than the older Gilbert wheels, which, IIRC, had metal shafts. I think your chances of successfully drilling out those small, old metal shafts from a plastic carbody are somewhere between slim to none. Its been a while since I replaced any of the brake wheels, but -- again relying on memory - in some cases, the mounting hole goes all the way through and I was able to push the shaft out. At least in those cases, I don't think they were glued in place, but relied on a tight press fit. In a couple of other cases, I simply cut all or part of the plastic shaft off the replacement wheel and glued the wheel in place. If you looking to use 'authentic' Gilbert-style wheels, then this might not work.
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