Sadly I ended up not really documenting any of this process. But here's a photo of the finished job:
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I touched up the playfield wear around the bumpers, magnet and ball drop points, and mylared over them. I rebuilt the flippers and replaced a bunch of targets — it plays really well, I love this game.
I glued the broken mixmaster housing and stripped and painted it. Instead of buying the decals from eBay I found glitter paper and made my own. I like that the original used real glitter which catches the light like only real glitter can, and the glitter paper I used does this. I'm happy with that!
I'd like to make some replacement plastics at some point. One is cracked and a few have missing corners, and the mixmaster cover has yellowed and is very scuffed.
One change I made was repositioning the Heart of Rock 'n' Roll target to the angle that the hole is cut at, and that the manual graphics portray it. Now it directs the ball towards the drop targets, or caroms at the REFLEX targets. It is a narrower target to hit, so it's more challenging.
Next stop: restoring the cabinet. Very minor artwork touch ups required, just a clean is needed. Some minor damage needs to be repaired. The three big things to deal with are:
• The coin door is dented inward and the edges are bowing away from the cabinet. I'll try to panelbeat it back into shape.
• The legs are rather rusted. I'll strip them and polish them up. If they don't come up very nice I'll attempt to spray paint them in a gradient/fade from the cabinet orange and yellow.
• The speaker box at the top has rusted and a previous owner crudely painted over the rust and smeared the chrome trim. The Bally logo has perished as well. I plan to replace the chrome trim, use black speaker cloth to cover the whole panel and CNC cut a new chrome Bally logo to go on top — it's a speaker box after all, why not make it look like a high-end speaker/amplifier!