The magnet area...or magnet hole as many XFiles are know to have. This can be VERY annoying. The ball will get "stuck" here and sink into the hole.
I installed the factory "fix" for this....in a word....worthless. One: it is not the correct size. Didn't fit perfectly. No reason to be that size either. Two: they want me to glue this down? I think not.
I gave it a test run. Balls jumped a bit when you were shooting the filing cabinet....that's not good. It did give the ball a lot more movement from the magnet, but at a severe cost.
My solution, while not beautiful, works well. There is about a 1/4 inch gouge at the magnet area. I filled that with GOOD wood glue. One that is sandable. I rolled with that for a week, but found that it was sandable...so every time the ball was magnetized there it would "sand" a little piece of and there were white specs everywhere.
I got some white acrylic paint, and sealer...did a coat of each and that made a huge difference...no more chipping. People that don't know the Xfiles actually think this is the original "art" so it must not look too bad. I debated matching the blue up, but like I said, people think it's part of the original work.
I recommend doing the glue...make sure you press down so there aren't air pockets so it won't settle on you...let it sit a day, sand it down a bit, then add more glue and repeat. Play a few games. If there is a depressed spot you need to 1. Add more glue, or 2. Use better glue that dries harder. Adding the layer of sealant over the glue helps it harden...make sure it is bone dry first though.