The screws that fix the handles to the doors keep working loose, and just spin in the holes when I try to tighten them. On taking the handle off to try and rectify this, I found the holes too small to wedge anything in for the screws to screw into. I also cannot do new holes in a slightly different position because then the handle will be at the wrong angle. Any suggestions for a quick fix, or do I need to buy new handles with a different configuration for the screws? Any suggestions welcome