Spring loaded bracket for glass plate

These brackets are made and modeled on a 3 mm glass bed. I had a lot of issues regarding the bed which was moving due to the thermal expansion of the aluminum underneath, so any calibration was impossible. Standard brackets are great for PLA, but if you mostly print ABS like me they are totally useless. Moreover, the knobs after just an hour of printing were totally untightened because of the heat.
I made these spring loaded brackets that should keep the glass bed from moving away and (in theor