Join Date: Dec 2000
Location: Toronto, Ontario, Canada
For the purpose of facilitating easier removal of the screw at some later date if required, I highly recommend the above (I use wooden toothpicks dipped into a good carpenter's glue) with one addition; before putting the screw in, rub the threads into some wax until there's a decent coating. When the wood glue hardens, it makes a nice tight hold on the screw; this can be SO tight that you can twist the head of the screw off when trying to remove it later. The wax prevents just enough of the bonding with the screw to allow it to be backed out again.
Trust me, I know; I have a couple of cobbled-together guitars (Strat-type bodies with Kramer necks) that both have an extra strap-button hole or two, complete with headless screws... I've seen others examples of the same problem, too...