I believe there are 2 slam tilt switches on FP, one on the coin door and one under the Playfield. Do not set these too tight, in fact, in home use, they can be gapped at least 1/4 inch apart since you should not be beating on your machines like machines sometimes are in a bar. These switches are there to protect the machine from abuse in the wild. If these are gapped too tightly, they can close during normal play and end your game.