CNC Spoilboard Clips for use with HDF Sheets

I use small rectangles of HDF (aka Masonite Hardboard) as spoilboard for PCB milling. If you've milled PCBs before, you'll know that the margins involved in PCB milling are very tight, and that a level and hard surface is one of the most important things you can do to make your milling operation successful. These clips will allow you to hold a small piece of hardboard snugly in place without introducing lateral pressure that might cause the board to bow.

Included are two different versions