Swingline Electric Stapler Gear Key

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I reverse-engineered a working key for my office stapler after the original one went missing. The manufacturer, Swingline, doesn't offer replacement parts, but I managed to create a new key that works perfectly. This solution is compatible with the model 520e stapler and its replacements, the 50201 and 50204. Since this design is entirely functional, it's not eligible for patent protection and has been released into the public domain for anyone to use freely.