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I've been in the workshop when someone hasn't clamped a thin pcb down properly when drilling and seen the resultant half severed finger.
@J0nathan please don't recreate that
NurseHolliday
The problem is not in getting the drill through, it's in getting it to slow down when it hooks up on the back side. Drilling circular holes in thin sheet needs care and preferably a pillar drill. Clamp the sheet down to a backing board and be ready for the drill to get pulled away from you as it breaks through. Punching would be better, but you probably don't want to spend £30 on a tool