Best way to enlarge spindle hole in vinyl records

Get a "rat tail" file at a hardware store and slowly rim out the hole by rotating it; do NOT use a sawing motion. I occasionally have the same problem with my Walker Proscenium turntable, which has a larger than average spindle.

I agree with the argument that too large a hole may increase your chances of off-center playback, but I disagree that tight coupling to the spindle is necessary or desirable for most turntables. If you have a noisy platter bearing, tight coupling (and clamping) transfers that noise to the record. This is why Roksan has a removable spindle. My Walker gets away with tight coupling and clamping to the spindle because the platter's air bearing is effectively noiseless.