Satin Doll
Williams, 1975I'm restoring a Williams EM that is missing the rear door of the backbox. What are my options to replace the door? The bottom channel and locking tab are still fastened to the backbox. I'm open to either finding a replacement door via Pinside or fabricating one myself out of a material (Masonite?) that I can grab at a hardware store. The photos below are just an example (Spanish Eyes); the door I actually need is for a '75 Satin Doll.
backbox door (resized).JPGI've made doors out of plywood before. Usually 5/8 fits tight in the channel so it doesn't rattle around. A lot of the new locks come with the washer that has the two spikes in it to dig into the wood and keep it from twisting in a round hole.
Metal door is currently out of stock at Marco:
https://www.marcospecialties.com/pinball-parts/1D-3594-2
What I have done is to use a 1/2" thick piece of plywood cut to the correct size. Then I drill a 3/4" diameter hole for the lock in the correct spot (use a spiked lock mounting washer for installing the lock). I also drill two 1/4" deep holes in the appropriate spot for countersinking the backglass slide bars (this is so you can close the back door all the way).
Thanks guys. I posted a want ad here: https://pinside.com/pinball/forum/topic/backbox-rear-door#post-5637731
I'll create my own if something isn't available.
One other thought would be to have an tinner/HVAC shop fabricate one. I'm guessing: hemmed edges and one side formed to fit the bottom track. What gauge is an original?
Would someone please post pictures of a metal door so I can see what it looks like from the side and the interior.
Also, I don't see why the backglass slide bars stick out as far as they do. Shouldn't they stop at or before the plane of the lock receiver? In both the open and closed position they extend well beyond the limit of the door recess.
20200509_093151 (resized).jpgTo answer my own question, the backglass slide bars stick out as far as they do when open so that the backglass must be locked in order to put the door back on.
It's for absent-minded techs who forget to lock the backglass. If the glass slides are still in the unlocked position, when you close the back door, it will automatically push the glass slide locks to the closed/locked position for you. Someone at the factories were thinking when they designed that system. 
Options include:
1. Find a used one.
2. Order a reproduction from PBR or Marco.
3. Fabricate your own with a Harbor Freight 30" bending brake.
4. Have one fabricated by a metal shop.
5. Cut your own out of plywood or hardboard.
Resources on this topic:
https://pinside.com/pinball/forum/topic/back-doors
https://pinside.com/pinball/forum/topic/why-are-so-many-back-doors-missing-and-why
https://pinside.com/pinball/forum/topic/aftermarket-backdoor
https://pinside.com/pinball/forum/topic/pbr-wedgehead-metal-back-door
https://pinside.com/pinball/forum/topic/bally-back-door-needed
https://pinside.com/pinball/forum/topic/wtb-williams-4-player-em-back-door
https://pinside.com/pinball/forum/topic/gottlieb-back-box-doors
https://pinside.com/pinball/forum/topic/should-i-paint-head-back-door
https://pinside.com/pinball/forum/topic/wtb-gottlieb-4-player-em-backbox-door
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Olympia, WA