I use speedplay zeros on two bikes, but I only have one set, so I have to swap them back and forth - which is a pain. I have a set of speedplay x's that I don't use and I was wondering if I could install the zero type reciever on the x's spindles. I have never disassembled them so I don't know if there are differences in the spindles. Just wondered if anyone has ever done this, or if the parts are available.