Anyone have a simple solution for a gust lock on a Lancair 4P?

I use three tennis balls and some bungee cord for my ES-P.  Drill two holes in each tennis ball and thread the three balls onto the cord.  Put one ball on each end of the cord, and one in the middle of the cord.  Tie a knot in each end of the cord to keep the balls from coming off.

Cut a slit in the middle tennis ball to fit over the trailing edge of the rudder, the length of the cord is such that each end tennis ball wedges in between the elevator horns and the horizontal, while stretching the cord enough to keep the rudder in position.

Is cheap, light, and works very well.  Wish I could take credit for it.

-isaac
N7842K