I am refinishing a neck thru bass with a redwood top. There were quite a few deep scratches on the top so I took it down at least 1/16". I got it looking really good but when applying the first coat of "tung oil finish" I accidentally scratched the top with my fingernail (which I clipped before starting ) so I had to take the top down some more. Now I am having trouble rounding over the edges on the inside of the horns near the neck / fretboard. It is impossible to get it with a finish sander and sanding by hand is going against the end grain and leaving scratches, but I need to use a grit that's coarse enough to shape the wood. Do you have any advice or tricks for getting into those hard to reach places? Should I use finer grit and more elbow grease? I was looking at some rubber contour sanding pads but I'm not sure they will help much in the tightest spots.