I have a set of WTB rims laced to formula disk hubs. The from is 20 mm through axle, and my Fiance wants them for her bike. I can find no info on conversion for a formula hub. Does anyone know if this can be done, or perhaps how to remove them so I can try a conversion kit. I can't seem to get them off and there are no lock-rings or other similar devices holding them that I can see.