Well I am back in the club.... Space shuttle has a special place in my heart, as it was the first game I ever owned back in the 1990s. A friend of mine had one sitting in their living room that they wanted to get rid of, so I obliged them.
The playfield has a few marks on it, the HV section of the power supply is shot, and the head had structural issues, but at least the game is complete.
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The worst part was the head. It looks like some one had tried to force the head down without taking out the bolts. The bottom piece of plywood had some pretty serious issues, and the whole thing wobbled.
To to address the issue, I put another piece of 0.70 hardwood plywood over the bottom piece from the inside. I matched all the holes to allow the wires to go through and the head bolts, and I moved the side brackets up that hold the speaker panel on. I attached the board with wood glue and deck screws from the bottom side where they wouldn't be seen. This took a lot of the 'bow' out of the original bottom piece of plywood.
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The head is much more stable now, and the backglass and light insert now line up better.
Someday if I ever repaint this cabinet, I will address all the nicks and scratches in the head.