This may be hard to put into words... but I'll try;
Taking the magazine completely apart is easily doable. Similarly it is fairly easy to re-assemble which I'll get to at the end.
During disassembly about half the time the clock spring will insist on getting ahead of you and get tangled up on itself. One end of the spiral spring has a hook that grabs a hole in the mag's outer body, the other has a long straight leg that slides into a hole on the inner drum. That long leg is usually what gets caught up if you aren't able to gradually lift the drum's pusher notch over the outer body pellet stop boss and simultaneously unwind it before it turns inside out. Worse case scenario if it does become a "bird's nest" you can carefully grasp the end with the long leg and feed it back out of the tangle, at which point the spring will snap back from a scary looking mess to it's correct form. Just be careful because it is fairly thin wire, and any gorilla-fisted attempts to untangle it may result in a deformed spring.
Reassembly is straight-forward. Inserting each end of the spring into it's proper holes, and carefully winding it at least one full turn past it's neutral state, and capturing the clear lid with the screw. The rubber o-ring can stand a spec of silicon grease, but is not necessary, since the friction it imparts is actually beneficial during loading to keep the cover where you place it for each pellet insertion, and that same friction does NOT impede the job the spring is doing.
Also note the set screw on the forward side of the magazine acts as a limiter for the assembly screw, carefully positioned it allows tightening the larger rear screw without cracking the clear rear cover.