I've had mine apart a couple of times now. Once to change the springs, and once to sand down the throttle ratchet to make it smooth. It it definately not for someone who hasn't taken it apart before.

Before I took mine apart I had help from the local Futaba rep. who took his apart first.

My 9Z WCII is currently an Airplane version, and I didn't want to loose any flying time sending it in to have it switched to heli, so I just sanded the ratchet down for now. I'll send it in this winter to have it changed to the heli switch configuration.

Dean