Let's better the hobby...
2 designs, I uploaded to Thingiverse:
1. Judge Dredd gearbox cover:
During my JD restoration I realized that the deadworld gearbox is open. I learned that at some point Bally changed to open version as part of cost cut.
I think open gearbox is not a good idea: no dust protection, and risk of fallen screws, washers while the playfield is lifted.
I created a perfect fit plug. Now my gearbox is closed.
(In the opened pic, originally there are 2 shafts and the screws to the motor.)
JD open (resized).jpg
JD closed (resized).jpg
https://www.thingiverse.com/thing:4678895
2. Indiana Jones drop target stop
This a known issue. The coil is not strong enough and/or the spring is too strong.
I've printed a mechanical stop, the actuator can't go back to full end position. This helps to the coil at the beginning, and able to move the actuator.
IJ drop1 (resized).jpg
IJ drop2 (resized).jpg
https://www.thingiverse.com/thing:4228366