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I got this machine to make button pins with the kids while school is out. I cannot get the mylar pieces to crimp around the button the way they should. The rest of the button will go together fine with the machine. Also, for the button pieces - I wasn't happy with the cheap plastic backs and the 500 pins that I had to insert into the backs. I assumed the back would be all one piece (button already inserted/included). I should have paid more attention to this detail when ordering.