Hi, So my son dropped his Peavey Foundation (which is exactly why I bought him his own rather than banging my fender around) and it seems to have loosened the tuner key (E and G strings) so that there is an audible rattle when played. The tuner machines themself work and are not loose, just the actual key that you put your fingers on to adjust. What is the best way to fix this? Adhesive? Thanks for your input.