I'm about to move on to the neck of my first project, and I had a question I can't seem to find an answer to. A while back, I cut apart a neck with a non-functioning truss rod, just to get a better idea of how a neck is constructed. The truss rod channel appears to be lined with some kind of material, which seems like a good idea. Do any of you line your channels? Is it a good/bad idea? Thanks! Here's a few pics of the project - These are a few weeks old, the contours have been carved, and I'm going to be routing the neck pocket today.