Originally Posted by
Simon Barden
BUT - before doing any of that, first check that the neck is fully screwed down and there aren't any wood splinters around the screw holes holding the neck off the pocket. Also check that the end of the neck/pocket is shaped correctly so that the neck is fitting properly in the pocket and not being held high at the corners (which will increase the neck angle).
If the screws are being screwed into the body first before screwing into the neck, then I would enlarge the hole size with a drill (running the drill in reverse is the best way to do it slowly and without risk of splitting the wood) so that the screws fit through the body holes without biting into the wood, which allows them to pull the neck down properly. If the screws are biting through the body and the neck, then there's no guarantee that the screw is puling the neck down as hard as it should. This was the recent cause of a bass neck having a high angle - so it can happen.