I finally finished de-rusting and rebuilding all the drop targets!
Here's what they looked like before.
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My rust removal workflow was:
Soak the big parts in Evapo-Rust
Tumble the smaller parts in the tumbler with walnut shells.
Buff the big parts and some of the smaller parts after soaking.
The "Meteor" Target at the top was giving me all kinds of problems with certain letters not staying up after reset.
After much trial and error I finally figured out what I needed to do to make the letters stay up!
There are 6 L shaped metal plates that are attached by small springs to the 6 Drop Target Reset Coils C1-34-3400- Stern called them Memory Drop Target Relays.
First, I tightened each spring by removing 2 loops. This pulls the L-Bracket towards a brass rod stopper and extends the brackets far enough to catch the drop targets up when they are reset. I also tightened the longer springs that are on each drop target while I wait for new springs to arrive.
Next I removed the assembly and manually reset the drop targets while looking closely at the little L shaped brackets on each coil. I looked closely at the end of the L-Bracket where each drop target catches and locks. There is a tiny plastic lip on the drop targets that catches on the L bracket. When I manually reset the targets and held the bar as far up as it would go I could see a tiny space (1 or 2 MM) above the L-Bracket and below the plastic notch on 4 of the 6 letters. On the two letters that wouldn't lock there was no space so I bent the L-Brackets down a millimeter and now all six letters stay up after reset!!
I'm still having problems with the right flippers. Sometimes they don't move when I press the button. . . I hear a buzz but nothing happens. When I press both buttons together the right flipper will finally fire.
I am going to replace the coil next - The flipper in question has a different coil than the left flipper and looks like it was replaced in the past. The lower right flipper has two EOS switches. One that is the EOS and a bigger one that closes when the EOS switch opens. What does this second switch do? I have rebuilt this flipper since taking this photo.
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Does it fire the upper right flipper?