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The Knee. The knee provides the lever action for the lift stroke and the ejection stroke. The handle (a 1" galvanized water pipe) fits over a pin in the large hole. The knee is machined out of a 2" square solid bar, and has 2 ears welded to it.

The 2 ears with holes in them connect to the top end of the yoke; this is the point the knee rotates about. The distance between the ear-holes and the pins defines the amount of lift.

[Not shown is a latching device which simplifies lifting the handle from the compression stroke.]