Heatbed small glass fixer

I've got a non-standard round glass (165mm diameter) for headbed (220mm).

So I had to design a kind of plastic spring to center and fix the glass.

Springs printed in ABS and sanded for a lot, but still fairly slipery and can't stop the glass from spinning :( At last I stuck my glass to heatbed with small kapton stripes.

UPD: ABS is quite slicky to stop the glass from slipping (rotating around vertical axis in my case).
I coated the spring friction surfaces with polyurethane glue. No