Wanted to help my buddy install his Custom Sparky long distance, and someone else sent me a PM asking how hard it was to do. Figured I'd post it here in case it can help anyone else.

I used a 1/4" nut driver, a 5/16" nut driver. and a Phillips screwdriver.

Step 1. Take the balls out of the game. Pull your playfield out and rest it up against the backbox. Protect the backbox if you're worried about denting or scratching the T-Molding. Now remove the 4 screws that are holding Sparky from the bottom of the playfield.

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Step 2. Rest the playfield in the extended service position.

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Step 3. Remove the clear plastic around Sparky's feet.
There is a 5/16" nut holding the plastic on the pop bumper side.
There is a 1/4" Hex spacer holding the plastic on the drop target side of Sparky.
I also removed the clear plastic above the hex spacer. 4 screws hold that plastic on.

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Step 4. Remove the back panel behind Sparky.
There are four screws holding on the panel. 2 on the back of each side. Use your 1/4" nut driver to remove the panel. Lay the panel on the floor of the cabinet.

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Step 5. Remove the 2 screws holding Sparky to the back of the chair and he is now free except for the spring in his back that should come off the coil bracket easy when you lift him out.

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Step 6. Switch over the screw and spring that are in old Sparky's back to the new Sparky. Look at it and make sure you screw it back in to the new Sparky just how it was in the old. If you get any turns of the spring caught under the washer, Sparky will not shake as much when he's getting fried because of the added tension.

Now put the new Sparky in the game.

1) Position Sparky so that you can get the spring back on the coil bracket easy.
2) Set Sparky in his spot on the playfield.
3) screw in the 2 screws that hold Sparky in back of the chair.
4) Lift the playfield and rest it against the backbox again. Replace the 4 screws that hold Sparky from the bottom. There are no holes in the bottom of the new Sparky (none in mine anyway), so you have to reach around and hold Sparky with one hand while you push hard with the screwdriver to get the screws to grab.
5) Put the playfield back to the extended service position.
6) Put the clear plastics back on.
7) Reattach the back panel.

Done.