Magic. Actual magic. I know its all physics and vibrations and sound waves, but guitar repair is magic to me, who knows nothing about it. I've got two hanging on the wall above my piano, like my piano, they see little use, but they see even less use than the piano, which is not a lot.
I should use them and practice scales more often.
My real passion is making them, but repairing them can be fun. More so when you have to be very creative with what you got. I fix this week, for example, a bone nut using baking soda and CA glue. A chunk of the bone nut was missing, broken off... Instead of rebuilding the whole nut, I made a mold, so to speak, using tape. Filled it with baking soda, and dripped CA glue on it until it became a block of crystal. then shaped it, and polished it... looked like nothing happened.