In 1982 in England the only replacement tuners were Schaller MNI3, sold as a replacement for Gibson mandolins. A novice, I knew not of spacing and gear orientation. I drilled them (gasp) all the way through to accommodate the fat Schaller ferrules. At the time I was just desperate to have a serviceable mandolin. Please don't hate me for what I did to my 1923 snakehead. I feel bad enough.
Q: Now that Stew-Mac offer the relic replacement tuners, what is the accepted method (actually I'll hire a luthier this time) to plug and drill new holes? I've bought the Loar era jig, too, but my local repair guy says you can't drill down the grain, even with a jig.
Is there a source for cross-grain mahogany(?) dowel for this purpose? The holes now measure ∅ 10.28mm
This is what I've come up with. Is this a good way to go? That's a 3 ⁄8"∅ tapered plug, ¼" deep.