I ran a lag bolt every 2' along the top of the really big saw horse. I suspended some light chain every other one for this. Then I ran a wire down, through a 1/4 inch nut, then back through the valve stem hole, then back to the chain with several wraps to secure. Now, the footprint of the nut was very small as it was touching the rim only on the edges.
This allowed me to rotate the rims as I sprayed. I did have to hold them long enough to spray the very bottoms.
