I mean this sort of thing
I've used these before without problem, but never into an
ebony neck.
Is there a useful rule of thumb for working out the size of hole to drill - not too tight, not too loose, but just right - so that the inserts will stay securely in place, but not chew the neck to pieces as they go in?
I've tried test holes in other woods, and an 8.5mm / 9.0mm hole (M5 inserts, outer edge of the "teeth" is 9.75mm diameter) works well. But I'm struggling with the first 9mm hole in the ebony, it's a really tight screw-in and I'm wary of doing some damage by forcing it.
Any suggestions, oh wise ones?
(And please don't say "don't use inserts" because the first hole is already drilled!)
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Thanks @WezV - will give that a go shortly.
Thanks again @WezV .