Ever fitted a set of wheel Pants and found they get ripped off ? well next time try this-
Make up the wheel spat with plenty of internal clearance,next make up a piece of wire the shape of two eye ends,screw the wheel pant with small screws taking the wire into a small 'V' shape,this V is soldered carefully with fuse wire onto the undercarriage leg,should the wheerl spat get knocked out of place it is an easy task to re-position it over the wheel.
There are one or two variations on this so experiment as to your own requirements.