I've been watching the Stewart covering system videos (very impressive, BTW) and the wing rotators seem useful if not essential in covering the wings. I searched the web and found wing rotators sold by Aircraft Spruce and others (they all seem to be made by the same company). However, a set is quite expensive ($600) and you have to buy separate, more expensive rotators for the fuselage.

Are the rotators necessary/worth it? Does anyone have a used set they'd like to sell? How about plans for building rotators?

Thanks, Jim