I have a nice late 70s rear Cyclone GT derailleur that I'd like to put on a 83 Takara, but the pulley wheels are a little chewed up. I have a donor ARX that I can take wheels from, but I'm hesitant to take apart the Cyclone for fear I won't be able to get it back together properly. It looks a lot more complicated than the ARX. How hard is the Cyclone to disassemble and reassemble, and where might I get instructions? My wrenching skills extend to tune ups and overhauls of bearing races, and that's about it.