Hey guys need advice , my friend bought a Yamaha Pac from the Ahn at this weird frocery store that also has a studio...bought it for $80. Very old by its looks . And i agredd to tune it for him . so i brought it home and tuned it...wanted to clean the guitar and took off the strap so i took it off and the nut also came off. The one at the bottom of the guitar!!! What should i do??!?!?! I tried screwing it back in with screw drivier but looks like its a perfect hole without grooves!