Hi. The screws holding the watjamacallit joint on one of our kitchen cupboard doors are no longer staying in place. So the door can come away from the unit when you open the door. Bottom watjamacallit joint is still ok (for now). What can I put in the holes where the screws now longer have purchase so that they. ... have purchase again. Worryingly I am the tech person in the house as you can tell by my use of technical terms. Help. Please.