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I know some guy use them and never heard of a problem, I have not had the need for more that much clearance.

I have read some old post of guys using the tapered spindles that suggest...

I have never had a problem with clearance, buffing a razor on my buffers, but I did make spacers for my 3 buffers from ½ in PVC pipe, so the wheel is at the extreme edge of the shaft and the nut...