BTW, stripped screw holes, especially in MDF is always a potential issue when tightening the screws. Don't overtighten them or the holes will strip out. If you do have a hole strip out, a quick "fix" is to remove the screw and stick a few pieces of toothpick into the hole. The screw will tighten against the new wood (toothpicks) which will expand out against the sides of the hole and provide some grip.
This "trick" is not a substitute for proper torquing of the screws in the first place, but it can help if you are already in the situation where you have a stripped hole.
Enjoy,
TIC