Craighill Jack Puzzle

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The Jack Puzzle is composed of six different notched brass bars that interlock in one specific way to create a unified "jack" shape.
It is exactingly milled, and weighs just over one pound. A desk object, a paperweight, and a true distraction — but be warned, if you take it apart, you might not be able to figure out how to put it back together…
(Hand-drawn assembly instructions are included)
· 1/2" Diameter bar
· Weighs approx. 1 lb
· Measures 3" X 3" X 3" (assembled)
· Solid Cartridge Brass (alloy 260 – 70% copper, 30% zinc)
· Bull-nose ends, lathe-cut