I agree that pants can be a pain in the butt yet they look great. You must "flat-spot" the axle. Use a Dremel or ******* file to faltten the axle at the location where the set screw goes. This flat spot will prevent the screw from rotating around...along with the wheel pant.

My SW died in a mid-air about 6 flights into it. It was a beautiful flying plane and agree with the other comments on its handling. Three points landings are a breeze.