Yup, they’re just lightly pressed into a tapered hole. You just have to turn them with a greater force than the string exerts on them, and ideally they stay put after you let go of them. Works well for gut/synthetic strings, less so for steel strings because those lengthen very little so friction tuners would be too imprecise.

Like linseed oil and caramel.

I’ve just bought it roasted. It was originally intended for billiard cues.

Edit: sorry, I missed the joke. 😅

Honestly, I don’t know. I didn’t expect to see literal air bubbles rising from the wood in the oil bath. That’s a lot of oil, so I expect several months for it to fully harden. Maybe I can speed up the process with an UV lamp.

You can make a mold for a keycap stump and stem cavity, make a resin cast, then glue the keycap on. Maybe you can modify this: https://github-wiki-see.page/m/imyownyear/Z-Butt/wiki/Z-Butt-Mold-System

I don’t need to cut it to final thickness right away, since I have to graduate the thickness by hand anyway. Being in the ballpark of 3 or 4mm might be enough.

Edit: also, most veneers I found were plain-sawn, and I specifically need quarter-sawn.