Cam Hold Down - GoldenRatio aka Fibonacci Spiral for Shapeoko and Other CNC's

Looking for hold down options for your projects? This version uses a 1/4" hole that can be used with many CNC, Laser Cutter and other projects that require a flexible, fast hold down system for anchoring your material.
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We have been using the CNC's at 757 Makerspace the last few months and using a wide range of materials for projects. One thing we found is that when using a spoiler board (aka sacrificial layer) is that screwing down work puckers up the material and also sometimes interferes with your project material. Recently we have been drilling our spoiler boards to accept 1/4" holes every two inches in the x and y position, this allows us to anchor our material using a wide range of options. The latest design we have been using is the use of a rotating cam to get tighter to materials that vary slightly and settled on the Golden Ratio or Fibonacci Spiral as the basis for the design.
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