Here is a picture of my Spectrum with the mod done, haven't even put the flipper bats in yet!

I upgrade all the games at the Ottawa Pinball Arcade to Fliptronic style, but sub in the normally closed high voltage EOS and add the capacitor, using an 11630 coil. Works amazingly well on every Classic Bally and Classic Stern, and on Gottliebs and Classic Williams I use an SFL-19-400/30-750 coil.

You may have to move the wiring harness and maybe the odd socket, some games are tight, like the upper left flipper on Power Play. I had to trim the back of the grommet the link stops on so the playfield could go back down, there's maybe 1/32" to spare... and all 6 flippers on Black Hole was a task.

Spectrum was relatively easy by comparison. Squeezing 555 wedge LED's in all the sockets however? My hands looked like I'd been fishing through a bag of razor blades and needles for a week...

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Yes, definitely the SFL-19-400/30-750 is the way to go, and also yes to the normally closed (high voltage) EOS. As for the coil stop, I prefer the A-12111.

I do this to all the machines at my Arcade, and to all the games I sell, based on the suggestions of Vid in this thread, whose advice on Pinside has had as big of an influence on my pinball repair and upgrading as Jimi Hendrix did on my guitar playing! This same coil and setup works great on Gottlieb system 1 and 80 also.

In any event, here are some pics of the Flash at The Ottawa Pinball Arcade. I can't remember how or what I had to do to make them fit, but the pics should illustrate what can fit where and work without any major effort. And yes, I just noticed that I never put in the final 4 screws in each assembly, I usually put 4 and add the others once I'm satisfied with the final position and everything else has a place (light sockets, harness brackets, etc.)

I have had nothing but compliments about how well the game plays, even from a hardcore pinball guy that hates the machine normally!

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The legends are true, Vid has never been wrong about anything that I have been able to determine, and this is one of my all time fave upgrades.

The Flash Gordon at the Arcade has had this system in it for 4 years, and still plays like it's on fire. It's been a while, but I don't recall having any trouble putting them in this machine. I would recommend adding the capacitor used on the pre-fliptronic system, as it extends the life of the EOS significantly. After 4 years of commercial use, even the EOS switch is still in great shape!

My setup includes; 16630 flipper coils, A-12111 coil stops, and of course the high voltage normally closed EOS, with the capacitor.

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You need this; https://www.pinballlife.com/williamsbally-end-of-stroke-switch-normally-closed.html

WMS/Bally part number 03-7811

My rule of thumb is to make it a perfect continuation of the angle of the return lane (if present), to prevent any ball hop or slow down. This way the ball whips up or down between flipper bat and lane. The old Williams generally still line up well and don't often require much, though sometimes adjusting said return lane is needed to get it as smooth as possible. Using Cliffy replacement lane guides on my old Bally's like 8BD and Flash Gordon makes it smooth as butter and fast as hell, combined with a modern Fliptronics system with 11630's as described in this thread. My single fave mod of all, thanks to vid1900 and this thread!