| The holes really need to be plugged with glued in wooden dowel rod and drilled to the correct size.
This isn't the best but...If the tuners use nuts from the top and almost fit, you can wrap some masking tape around the nut for a snug fit and that will center the tuner in the hole. The washer will need to be on the nut before wrapping the tape.
The tuners need good support top, bottom and in the hole so if there is a large difference in the hole size go with the first suggestion.
mech
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U.S. Peavey Club Member #137, Official Short Scale Bass Club member number 186
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