Printinz clamps for DaVinci 1.0 Pro

I bought a PrintinZ print bed for my XYZ DaVinci Pro.
http://www.printinz.com/
My binder clips were either too big or too small so I made my own.
2 clamps at 20mm wide go in the front.
1 clamp 10mm wide goes in the back.
Print in ABS with 50% infill.
There is a brim on the bottom. trim off post print.

R1 - It seems that after a couple of months of printing, my hex clamps get weak and the printinz plate starts to slide around a little. I made these screw type clamps to get more press