I am currently building my own guitar and I have ran into some trouble. When I try to screw one of the nuts on the peg it does not fit but all the others fit and I don't know why. It looks the same size as the others do could there be a small dent?
Tuned2 Possibly I suppose. If you're talking about the nut which goes on top of the head stock to retain the tuning machine, there could be a nick, (or a "dent", if you prefer) on the threads of the tuning machine. Or, the nut itself could be defective. Have you tried taking another nut off and trying it on that machine? That process of elimination will immediately tell you which part is bad.