We make parts for pinball machines

Ball Trough Magnetic Jam Protector


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This ball trough jam protector breaks the magnetic circuit that sometimes causes balls to hang up in the trough. It also eliminates the metal-to-metal contact that adds fine scratches to the ball, increasing the amount of time it takes to turn them into rolling sandpaper in your machine. This version is designed for use with Bally-Williams machines from Indiana Jones onwards, including all WPC-S and WPC-95 machines.

It is particularly effective with Judge Dredd and Theatre of Magic, and important if you wish to use chrome steel balls in machines with magnets.

The part is a PETG shim, precision cut to line the floor of the ball trough. With this shim installed, the balls run silent in the trough. The protector also reduces the energy of the ball, reducing the shocks and vibration caused by ball impacts in the trough area.   


We made this for our Judge Dredd upgrade kit, where a slightly magnetized ball trough can cause all kinds of problems. But it will solve similar problems in other machines, making it easier to use chrome steel balls in machines with magnets.

Install it by inserting it into the trough through the trough rear access hole, sliding it under the balls.



  • Model: BTP1
  • Shipping Weight: 0.1lbs
  • Manufactured by: Pinbits

Andre Huijts
5 of 5 Stars
The best ideas are really simple. This is brilliant in it's simplicity. It works great in my JD. Although I sanded out the dents in the trough I still didn't like it plus this reduced the wear on the balls. Installing it couldn't be simpler and it stays in place without any problem. I have no idea what the magnetic function is because Pinbits was regretfully out of the chromium balls at the moment I ordered, but even when you don't consider that, this is definitely worth it's money.