Fellow Helmut, having dealt with riggers in the past, I anticipated the screwdriver technique; that's why I mentioned the bit about "without destroying the structure and finish of the helmet" Someone out there must've had something to do with the old style of taped helmets. Any assistance with removing the tape from an old -33 would be mightily appreciated. Otherwise it's the angle-grinder. The stuff sticks like s*** to a blanket.......