Former Wisconsin power company worker Jerry Kieffer didn't exactly take it easy when he retired. Instead, he dedicated himself to building perfect recreations of mechanical objects, in very small scale.
What started as a 1/6th scale Harley-Davidson engine (which actually runs) evolved into a yet-smaller 1/8th scale rendition of an entire Harley-Davidson Knucklehead bike, which is currently in the process of being built. When it's done, Kieffer intends every aspect of the motorcycle model to work, from the kick start mechanism to the gearbox and the speedometer.
Here are a few photos of his work in progress.
 Full-Size Knucklehead |  Engine-in-Frame |  1/6th Scale Engine |  Forks |
 1/8th Engine |  1/8th Engine |  Primary Cover In Place |  Transmission, Open |
 Kick Starter, Gears, Etc |  Components |  Clutch Cable |  Rack Gear |
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