A few pics on how I mount my wheel pants. I use Dubro 5/32 axles. I get longer axles than I need and cut them to size. The Sig wheel pant mounts are made of brass collars set in plastic and a set screw to keep the wheel pant from moving when screwed tight. I grind a flat area on the bottom of the axle for the set screws. I usually use as large of wheels as I can get in the wheel pants. I use two mounts on each wheel pant to keep them more rigid. The nice thing is if the wheel pant gets bumped hard the plastic mount housing of the wheel pant will break before ruining the wheel pant. When that happens just remove the broken one and replace it with a new one. Pics do not show set screws installed yet.

Don't let the wheel rub the wheel pant anywhere or it will act as a brake. Might have to put spacers on the axle to keep the wheels from touching the sides. I fly off a grass field and don't have any trouble as long as the grass doesn't get to long. If it gets that long everybody has problems wheel pants or not. "Waiting for warm weather!!!"