#1
Not the screw itself, but the hole the screw goes into. It is now useless.

What should I do? I've considered drilling another hole next to it, or securing the screw in the hole with superglue.
#2
Its happend to me,here is the best trick in the world. Take out the screw and put a toothpick in the hole,cut of the tooth pick where the hole ends,now put the screw on/in the toothpick/hole and start screwing in,the toothpick will shred up and pack it, it works everytime i swear
Gettin rid of me RR3 =(
#5
i ender up taking mine to a gitar shop...they patched it up for me
#6
I got a piece of dowel and made it the same size as the hole, glued it in there, then screwed it back in when it dried, it's solid as a rock now.