You might have a whole new market for yourself. What exactly is the problem?
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Ben, You can only increase the diameter of the hole. I don't see any way you can narrow its diameter, except maybe by gluing a thin piece of plastic or other material that has been pre-drilled to the more narrow diameter you may prefer, centered over the existing spindle hole. I don't know of anyone who is in the "business" of doing this. But, like the other guy asked, what is the problem?
How valuable is the record? Off the top of my head, a reamer will cost say $25.00 or more. I have neasured the spindle of a Dual, removable spindle at approxinately .279"
If you wanted to put a thin bushing in there, first you need material. Then you need the bushing made. If you have to pay someone to make this bushing, it might cost more than the price of the reamer.
So, back to square one. Aside from the desire, what's the problem.