I routed a truss rod channel. This time I routed it just a hair deeper than the rod.
I normally try to be exact, and then end up sanding down the top of the bar to make it flush.
This time I sanded the neck blank down flush to the bar. I used my flat sanding leveling sanding block, This is a base of 3/8" polycarbonite (perspex to the Europeans) glued to an old jack plane with enough weights bound to it to weigh about 5 pounds, You just push it around over the part you are making flat. The weight is enough to make it abrade and the fact that you are not adding pressure keeps everything even and flat.
It works and next I line up the fretboard and drill some pin locators. I've tried toothpicks but they don't hold up. Tiny brads work and they don't damage saw blades much......but they don't do them any good either. This time I've got some bamboo grilling skewers that should be stout enough to hold, and easy on saw blades as well.
SR