I just added a flipper rebuild in my 1980 Blackout. When I played it, the flippers seemed weak with not much power and jittering. I adjusted the EOS switch a few times with no improvement. I then reflowed solder to all the coil and flipper connection and still no help.
The flippers feel fine until they transfer to low power when hitting the EOS switch. My best guess is that the new coil springs are to tight and pushing the plunger back into the EOS switch, which is making the flippers jitter and weak. I'm thinking of cutting and shortening the coil return springs to lessen the spring power. Additionally, the plungers are moving smoothly into the coils and the flippers are not to tight against the play field.
Anybody have this happen to them? My next step is to cut down the coil springs or put the old ones back on.
KIMG0045 (resized).JPGKIMG0046 (resized).JPG

I'm also thinking about adding stronger coils, but not sure which ones are ok to buy

Yes, they feel good and not to tight.

Wow, I cleaned the new switches and there was an improvement. Question, does this blue wire on the middle coil lug supposed to go to the outside leaf switch or does it matter? I still feel the flippers should be stronger.

1581572791411533834874 (resized).jpg

15815727667836195226 (resized).jpg

I only removed the switch wires and didn't bother remembering which end of the switch they were attached to. I was thinking since it was a contact/no contact switch, it wouldn't matter. That's why I was asking above if it would make a difference. Thanks for everybody's help. The flippers seem to have enough power until the EOS switch opens. Then the flippers kind of flop back until the switch makes contact again.

Cool, thank you. Cleaning them seemed to help. Maybe I'll give it a little filing. I just used a dollar bill before.

Yes, I have a flex stone. I'll give it a shot

Tried the flex stone and maybe they improved a little bit. The flippers are actually playable now, but they jitter when I try and catch a ball. This causes the ball to hop off the flipper slightly. I haven't had an old Williams in awhile. I might be used to new Sterns. Not sure.

Not sure if I have one, but something more abrasive, right?

I used a nail file and no change.
I thinking now it's the coil stops. They weren't replaced, because you have to buy the entire flipper bracket. It's one piece. When I have time I'll remove the bracket and smooth/flatten them out. Would anybody agree?

I will, thank you

Amazing 1980 coils stops lasted 40 years. Haha, last 40 games now.

Your right, I just didn't want to buy the entire bracket.

Brackets on order. I'll update the forum in a week. Thanks for the expertise.

Told you it was an easy question. Replaced my brackets that had preattached coil stops and they are working great now.
Thanks for the Pinside help!