2 Post Trem Question

[Simon Barden]

My inserts (Wilkinson) measured 9.8mm wide over the splines. I read somewhere on-line that a 'letter' series 'S' drill was the right one for hard woods (about 9.35mm dia), So I bought one of those (expensive) but that was too small, so I used a 9.5mm drill. The insert went in very tightly (despite the wood splitting) and I definitely needed my stud puller to remove it. You really want the hole size to match the diameter of the solid part of the inserts, so it's just the splines that are forced into the wood otherwise you increase the risk of the wood splitting, though with a softer wood than Ash like Basswood, you can compress it a bit more.