If you buy this servo from Marco for the Tommy blinders, there are several things you'll need to do to get it to work in the game. It's definitely a nice servo as it has brass gears with bearing guides instead of plastic. Should last a long time.
First, as Marco's website states, you'll have to swap a couple connector wires. It comes in the package with the wires in the connector as brown-red-yellow. The brown and red wires in the small black connector housing will need to be swapped. So when looking at it from left to right it will be red-brown-yellow. Leave the yellow wire as is. The red wire goes on the left side of the board. Should be a red stripe painted on the board for reference. Red is +5V, brown is ground and yellow is signal.
Secondly, this servo spins the wrong direction. When connected it spins clockwise rather than counterclockwise. You want it to spin counterclockwise. In order to reverse the direction to get it to spin counterclockwise, you'll need to open the case up by removing the 4 screws. The back and front of the case come off. Be careful on the gear side as the gears can fall out.
Pull the circuit board out and pull the motor out with pliers. The motor is held in with white caulk but comes straight out. Also down in the case is a potentiometer. It's held in with a tiny Philips screw. Remove the screw and pull the potentiometer out. Be careful not to turn the knob once removed. The potentiometer knob is indexed and fits into a slot in a gear. You'll see when you remove the potentiometer.
In order to reverse the servo, swap the two motor leads on the circuit board. Also, swap the two outside leads on the potentiometer. You'll need to do this with a soldering iron. The board, pads and wires are small so be aware and be careful.
Once done, reinstall the potentiometer and screw. Remember to index the potentiometer. The knob fits into the gear slot. Reinsert the motor. You may need to jiggle the gears to get the pinion to index into the drive gear.
Install the circuit board, front and back case and 4 screws. Connect to the servo board and test under diagnostics.
When installing the blinder arm back on the servo, use the silver metal machine screw that comes with the new servo and not the black wood screw from the old servo.
Just an FYI, make sure connector J2 on the shaker board inside the cabinet below the left flipper switches is disconnected or the servo will never work. Leave this connector permanently disconnected.