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I had to replace my garage door switch today, and used a technique that some may find helpful. I have Serial # 620. I was skeptical about the switch being bad as my machine is very new and has very few games on it.
First, I knew the switch was wonky when I was getting chatters form the garage door in the closed position, and when I put the switch to continuity check from my meter, it was showing an intermittent closure when the switch was pushed to a solid closed position.
I removed the VUK exit, as well as the garage door wall to make access to the switch a bit easier. I also took this opportunity to add mylar to the VUK exit drop, and the MPF ramp exit area.
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I used the closed side of a small 13/64 dogbone wrench, and took a small piece of duct tape on the bottom. This wrench grabbed the locking nut on the underside of the switch, and the tape prevented the locking nut from falling down (and rolling into the depths of the machine) when I loosened the torx screw on the top side of the switch.
I used the same technique to install the replacement switch, putting the locking nut in the closed end of the 13/64 dogbone and using the small bit of duct tape to hold the locking nut in place as I screwed in the torx screw from the top side of the switch.
Make sure you don't tighten the screws all the way at first, you will need a tiny bit of play to get the switch position adjusted right to get the best closure when the door is closed. Tighten fully when you have the switch adjusted.