Quoted from Groo:
After a month now I think I'm really annoyed at the left lane not activating the pop bumper because of that screw. Can I just take that screw out and not worry about it or do I need to cover the hole up? I guess I don't want it to chip or something from that screw hole and spread.
Just remove it and put a piece of mylar over the hole. It will improve the action on the top left pop bumper, and I've never had the ball get stuck there.