a 2mm screw will be too small. a 2mm washer would be too small and flimsy being made from nylon to hold itself out of a 4mm hole. the bracket holes will need to be the same size as the holes in the pcb. i am a mechanic, a machinist and a metal worker. i also know exactly what i did and saw when putting on my universal gpu blocks. i am just trying to save you a headache and time and possibly money.
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