Well, I was practicing today, and when I got up, the cable caught on something and yanked really hard on the input jack. A little piece of wood near the screw hole broke off, so half of the sides of the hole are gone, so the screw won't get tighter and the jack falls out easily. Right now, the jack only pops out when I remove a cable, but still, if anyone has any ideas how to fix it entirely, please tell me. I have a strat by the way.
A bigger screw might help..
Fill the hole with wood filler, then put the screw back in
You could try both of these, although filling and re drilling is your best option. Make sure all of your wires are in-tact and keep them out of the way when doing the repair.
What stores have wood filler?