MakerFarm 8" 3mm Borosilicate Glass Bed Leveling Corners

I recently switched from hand cut 1/4 inch plate glass to 200 mm X 213 mm X 3 mm Borosilicate Glass Bed and needed better corner clamps to hold the glass & bed heater in place and accommodate easy leveling. My 1/4 inch plate glass plates kept chipping out of the face of the print surface leading to lumpy prints on the base. I print with ABS so I'm guessing all the heating and cooling got to the glass. The corners are contoured underneath to mate with both the glass bed and the heating bed, holdi