Howdy folks. I've got a 1986 RB630 Roadstar bass that needs tuners. I can't afford to buy 4 original Velve Tunes, so i'm looking at aftermarket options. The O.D. of the Velve Tune bushing is 17mm, and I'd prefer a Gotoh-style tuner to a clover. Are there any off the shelf options that would drop in? I found this Wilkinson that looks like it might do the trick, 17.1mm bushing, and the price is right at $10 each: I also have a set of Yamaha tuners knocking around that would work and looks pretty good, but they use 14mm bushings. Is it possible to add a bushing to the post holes in the headstock to reduce the I.D. from 17ish to 14mms? Thanks so much!