Vid,
Will you do an addition about Gottlieb 80-80B flippers?

Awesome!
Thank you so much, Vid!

I have a coil heating quandary. Two games, Comet and Robo-War. Did a mostly complete rebuild on the Robo-War (sans linkage), and the left coil heats up when energized. Right flipper is a little weak, gapped well.
Comet, the right coil heats up when energized, gapped well.
I replaced the molex connectors on the flipper board, and all flipper connections in the boards. Replaced the diode on the coil. Why are my coils over heating when the EOS opens, but only on one of the coils?

Banded end of diode is on the low voltage or thick-wire lug, away from the EOS switch. And actually, no, the ball does not make it up the corkscrew, but I have not done the rebuild on Comet. I notice I have the 23-600/30-2600 coil on the right (correct) which is getting hot (looks fairly new, like it was replaced before I bought it), and the left, not heating up, is an 11630-50v, not an original to the game, but looks like it has been in the machine some time. It needs an entire flipper rebuild, but could these mis-matched coils be an issue?

I'll comment in two weeks when I have rebuilt it, and thinking of getting two new coils as well.

Also, Robo-War, with the rebuild, does have what feels like much too much heat in the left, and the flippers are too weak to achieve the ramp lock, even though gapped properly.

Thank you! 11630 on the left is snappy and works well! I will keep that coil!

Any thoughts on that Gottlieb coil heating up too much?

I tried a couple things today on the machine. Jumpered the EOS switch: No better result. Tested the lugs: all six measuring 24.5 vdc. Had a tiny bit of play up and down on the flipper bat shaft--good. Had a bit of play with the coil in frame--not good.
I used the extra washer springs to push the coil more toward the coil stop.

Also noticed I tried to raise the flipper up a little on the playfield. So I lowered it to just below (1mm) straight along the in-lane line, and I can get the ball up the ramp. It's tough, but was able to do it consistently.

I don't know how Vid feels about this, but maybe the spring does not have enough tension? You could shorten the length of the spring, and that would increase spring tension to pull the flipper down fully.
It could also be an alignment issue; if the assembly bracket has a little twist in it, I would recommend looking at that first. Make sure the coil is alligned properly.