That's kinda the hard part, comming apart and going back together is really nothing, it's knowing what is broken if anything, and reassembling....the only way I learned was taking apart and laying all the pieces in a line, and taking lots of pics along the way just for a reminder of how it goes together.
once you get that pesky pin out, the top/outter drum lifts off, its sorta spring loaded, not something that will fly up and off on you, its just a strap of metal across the center pole that holds the shoes in place, and its curved which causes the spring action.....more or less since it does function for you, doesn't sound like its broken inside, more like something got bent out of shape......
you may also want to check and make sure the solenoid with the lever on the motors base plate is popping up and down like it should, this little unit is what touches the finger on the clutch to cause it to run at slow speed.......
we can try and talk you thru this, but a pic of yours would probably help, maybe we can see whats out of alignment for you.......220 or not, your clutch should be the same as the ones we have here in the US
Does the clutch unit as a whole, wobble?.....with it removed from the machine, can you place the unit on a flat surface, and wobble the clutch while the motor remains still........if so, this is just that little C-clamp inside has broken or come loose from the motor shaft...a simple fix
before you give it up to the ghost.....let's see if one of us can get you thru this and repaired.....
worst case is I can probably send you a whole clutch assembly, but your gonna have to mount it to your motor......tighten the clamp, slide the outter drum on top, push down and hammer in that pesky pin.....and your back in action again....