After many years of putting up with main wheel shimmy on my RV-3, and trying a number of solutions, I finally tested the shimmy without wheel pants. Success! No shimmy at any taxi speeds. However, I don't want to fly without the pants, so what can I do? One recommendation was to put weight in the nose of the wheel pants (on the assumption that it was similar to flutter in an unbalanced aileron), but no improvement. Has anyone experienced this problem and found a solution? These are old-style pants. The problem is alleviated if I reduce the tire pressure to 15-17 PSI.