The other day, I picked up a Fender F55-12 in a dirty distressed condition for a song. i set about taking off the old dirty strings off, and giving it a good clean. Surprising it cleaned up well after removing the dirt and grime, its now a clean guitar with no bumps or scars, and the woodwork has a nice sheen, the fretboard came good, and the frets are in good condition. The machine heads were showing signs of corrosion and need to be replaced. The fly in the ointment is after removing the trussrod cover on the headstock, I find there is no adjusting nut, and i see it has been broken off. Does anyone have advise on how to get this fixed? Its a shame to let a nice guitar go unrepaired.