Adjustable Bed Clamps, now in OpenSCAD.

These print bed clamps are adjustable without removing the glass. The side clamps have a recessed area to keep the print bed from slipping up and the wedge adjuster is in line with the y motion to avoid any collisions on the sides. The screws are 20 mm M3s.
I do the bed leveling with a digital indicator mounted on the extruder carriage and the side clamps finger tight. Once it's level, I tighten the side clamps.