I just drilled the head off just don’t use a bigger drill than 3mm
The metal is relatively soft so drills quite easily, start with a 2mm drill or smaller
The head comes off exposing enough of the shaft to either place in a vice or use pliers to grip and unscrew.
I used capheads when I assembled mine as I know that button heads can cause this problem, but cap heads are slightly high to go under idle gear so I used the provided button heads only there.
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