You can, if you are careful. The method is to indicate the position of the new index hole on both sides of the envelope with your template, and carefully insert the 'anvil' part of a hole punch through the large centre hole and between the active magnetic disk and the envelope. Punch the index hole on one side of the envelope then repeat the performance with the other side of the envelope.
I found that it was very rare for my 'flippies' to be unusable in my Z80 CP/M computer of the time.
Of course when we were able to afford those new-fangled double-sided drives, the whole incentive to make 'flippies' disappeared overnight.
I found that it was very rare for my 'flippies' to be unusable in my Z80 CP/M computer of the time.
Of course when we were able to afford those new-fangled double-sided drives, the whole incentive to make 'flippies' disappeared overnight.