how to adjust hole size with leather punch?

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have just received an Amtech leather hole punch but cannot turn the revolving head. Is it locked somehow and how do I unlock it?
Hi I have just received your revolving leather punch plier. (B1400 stock code) The head does not rotate. The black plastic arm (how is it supposed to be used?) does not release or perform any function? Similarly, the silver locking...
can i get rivets to fit my pliers to fasten 2 pieces of cloth for a suitcase zip. i lhave the leather punch and eyelet plier set.