The screw was created with a 90degree "V" router bit using a two start and a 1 inch pitch. One of the starts was removed with a 1/2 inch straight bit. The taper was set by eye so the degree is unknown. The screw is 15 inches long and 4 inches in diamter at the head. The rest is 2 1/8 dia at the thickest part just under the head.
The slot in the screw was created by using hot glue to attach the screw to a waste board which was clamped in the horizontal vices.
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Last modified: July 14, 2011