New, never installed rudder trim kit for the RV-10, RV-9 and RV-7. It uses spring bias controlled by a knob mounted on the bottom of the panel. See:http://www.aerosportproducts.com/ruddertrim.htm
. Installation video available on that site.
I hung so much wiring, fuse blocks and brackets below my RV-10's subpanel that no room exists for this system. The springs will almost touch the bottom of the subpanel; make sure that you have at least a two inch wide path before buying.
New price is $250. I will accept $175 via PayPal. Priority mail shipping on me to the continental U.S.