I've done it on the upper flipper of a star gate. Mostly a drop in replacement as long as the spacing works. Buy a new mech from pbl with an high voltage eos switch. The coil I used is a bit too strong though, still need to find the proper strength.

I used an FL-11630, and it seemed stronger than the original gottlieb mechs, but not so much that I thought it was dangerous or anything.

It's hard to do an exact comparison as the size of the coils is different. Class of 1812 and Stargate use a A-25959 which should be 3.85ohms. The strongest williams coil (11629) is 4 ohms, and an 11630 is 4.7. But they're longer, so I think that gives them more power overall.

Yep

The Gottlieb flipper mechs are stronger flippers than Williams. If yours aren't working, then they are put together incorrectly or are in need of a rebuild. Here is a picture of my 1812 flippers. I hope this helps.

You might have a mushroomed plunger. I usually just grind them down and put the back in the game. Cost for grinding flipper plunger = $0.

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Don't swap them. Rebuild the ones you have and make sure the alignment is proper. The Gottlieb mechs have a far greater range of travel than the Williams mechs.

One of the most satisfying shots on that game is backhanding the left ramp repeatedly during multiball. Not sure if that is possible with different mechs.

They are nowhere close to as powerful, even with the extended range. It's not even close. I replaced a freshly rebuilt mech with a Williams and the difference was dramatic.