Try doing a search on the forums for more info. I know this comes up occasionally, including a thread several months back regarding a European utility bike. I don't recall how that one was resolved; there was some concern about locating replacement cartridges. Do you think you could do an adequate clean & re-lube with the cartridges in place? Otherwise, you'll probably need to tap the cartridges out with the spindle and then deal with how to reinstall. Then again, the clicking you observed may be due to either the interface of the crank on the spindle or the interface of the cartridge in the shell.