The neck on my bass is not orginal, and isn't an ideal shape. The base(?) of the neck, the part where it meets the shoulders, is quite big. so big that playing in the position on (the g string) F F# G is uncomfortable. I've been bringing my thumb around to the side of the base of the neck, but unfortunately there's varnish on it which is really bothering me. It feels manky; there's too much friction. Can I just sand the little patch that I'm using? Will this leave a really obvious DIY-looking patch on the neck? I could post a photo tomorrow if it'd help..