Anyone who owned a Radio Shack Armatron robotic arm in the 80s likely has fond memories of it. I still have mine, with all of the accessories, and it still works!
In this 8-Bit Guy video, he restores one that he bought online for $20. During the restoration, he shares an invaluable tip. This thing is filled with gears. To keep them all straight for reassembly, he photographed each step of the disassembly. To reassemble, he just looked at the pics in reverse order.
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