Devil's Horn CNC Clamps

So I just had a thought and ran with it.. dunno how well these will work long term but they work. The corner clamps aren't as useful but I'm throwing them in here anyways. If you use these, I'd love to hear how they worked for you.

They use 1/4in bolts. The ones pictured are too long (1/4 x 2in bolts). 1/4in x 1.25in or 1.5in bolts will probably work better.

Update: Added longer clamps.