This is my new-to-me 1969 Precision. Everything about the bass is original with the exception of the pickguard (which I'd like to change to a nicer tort or possibly black). It has been well played over the past 36 years. Despite significant fret, fretboard and neck wear, it plays great all the way up the neck. The bass is light and resonant, and the tones are incredible. There's nothing like the sound of a P-Bass. I would like to bring it up to optimum playing condition. As I mentioned, the frets are worn, and there are grooves in the fretboard. The back of the neck has several spots where it's down to bare wood. This bass will probably never appeal to the hardcore collector, but are there things I can do to improve the bass while maintaining its integrity? Does it even matter at this point? Also, the neck appears to be quartersawn rather than flatsawn maple. Is this possible?