I wondered how many of you use the pinking rotary cutter. I think I would want one, but need to know something. Can the blades fit on another cutter as long as it is the same size. Do you need to always use a Ofa blade on a Ofa handle or a Fiskars on a Fiskars handles? In otherwords, are these things interchangeable? Also, how many like the large ones 60mm