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PROTO-JEM, a custom prototype design facility, utilizing the latest in CAD-CAM 2D/3D software to design and produce products. Located in Windsor, CO, we use a CNC Mill and our precision designs to custom fabricate finished and prototype parts that meet customers needs. We have also created specific tools for Horizontal and Vertical Mills, Sherline CNC Mills, hand tools, and we've also created upgrade kits specifically for Deering Goodtime Banjos.