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The screw hole is not meant to take the weight of the board. Check your printer calibration/tolerances. The PLA prints you see in the pictures have lasted 8 months now with daily use.
They are however susceptible to kicking the part by accident and ripping it off the screw holes. There are other versions of this part I've uploaded with different thickness for the screw holes requiring longer screws, but from memory they're for different sized wheels.
But thanks for your feedback. Feel free to post a remix.