I haven't taken apart a Cyclone before, but I believe it has the same internals as the Suntour Blue Line that I overhauled last week. Watch this video by RJ the Bike Guy:


Cyclone derailleurs are excellent, and worth the effort - especially if it just needs to be cleaned and lubed. Watch the video a couple of times before tackling it, and keep it close in case you get lost in the middle of the process.