I seem to have let this thread stagnate a little. Sorry about that (and thanks for the kind words), I’ll try to get me finger out and show some progress.
The body’s just about ready for finishing, so back to the neck. I like to use threaded inserts and machine screws to attach the neck. I know that woodscrews will hold a neck perfectly well, but I seem to be screwing and unscrewing quite a lot before finally getting the instrument finished, which isn’t really a good idea with woodscrews.
Some people seem to have problems installing threaded inserts so I thought I’d show how I do it. These are the inserts I use, and to install them I use a piece of threaded rod (or a machine screw with the head cut off) and two nuts.
By the way, before installing the inserts in the neck, do a trial run on an off-cut of the same wood as the neck
to determine what diameter of hole you need for the insert. For a relatively soft wood like mahogany it could be the root diameter of the thread on the outside of the insert, but for harder woods you may need to make it a bit bigger.
The first thing to do is to countersink the holes for the inserts. Make the outside diameter of the countersink at least as big as the outside diameter of the insert. This is to avoid chewing up the surface as the insert starts to screw into the wood.
Put the threaded rod into the chuck in the drill press and screw the two nuts onto it.
Tighten the two nuts against each other to block them on the threaded rod.
Now thread the insert onto the rod.
Bring the chuck down to the hole and apply downward pressure. How much pressure will depend on the wood and the hole size. This is why you’re doing a trial run before attacking the neck.
At the same time turn the chuck by hand and screw in the insert…
… until it’s all the way in.
Now release the threaded rod from the chuck.
Unlock the nuts. Screwing in the insert will have tightened the rod and locknuts against the insert and locked everything up solid, but unlocking the nuts will release the rod.
And unscrew the threaded rod. I then wick a few drops of thin CA between the insert and the wood and they’re never going to budge.