#crazy-ball (1948, CCM) is recently up and running with just a few additional details to work out (that aren't related to game play--e.g., wiring on coin door for coin chute relay and game counter). Getting it working again was pretty straightforward, but not having a schematic felt like working without a net.
The machine features a "spinning bumper" that shoots the ball around the playfield or gives the ball a tremendous spin. Chicago Coin first used this with Spinball (which came out in May of 1948, Crazy-Ball came out in July) but then not again until 1973 with Hee Haw (albeit with a different style).
Principal objective is to hit the C, R, A, Z, Y bumpers (in order) to lite the "extra special hole" (for five replays!). Otherwise replays are won via certain scores.
The rubber on the spinning bumper was hard and misshapen, but I was able to make a replacement.
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The spinning bumper is controlled by a small motor on bottom of playfield that is run via a separate, smaller transformer in the cabinet and options of different voltages for controlling speed. It took a bit of effort to get the motor clean and working smoothly and quietly.
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Will try to record a video of gameplay.