One of the most common problems when working with screws is that they can easily shred. This can be incredibly frustrating, especially if you're trying to get a tight fit. There are a few different ways to stop your screws from shredding, and it really depends on the cause of the problem.
If the screw is stripping because the hole is too big, then you'll need to create a smaller pilot hole. You can do this by using a smaller drill bit or by countersinking the hole slightly. If the screw is stripping because it's not going in at a 90 degree angle, then you'll need to use a countersink bit to make sure that it does. Finally, if the screw is just spinning and not catching, then you'll need to use some thread-locking compound on it before screwing it in. This will ensure that it catches and doesn't spin out.
With these tips, you should be able to stop your screws from shredding and finally get that tight fit that you've been after!