Great idea and thanks for sharing the tip Spadstick! I've just tried it on my fun fly plane (RUOBO 46; Design and made in China) which would not want to do the elevator or harrier before now it would easily do the elevator and harrier. Still have a smidgen of wing rock. Will try different lenght/location when I go out next. BTW I use the outer nyrods as the tubulator strips.

Now to get it to flatten its spins!!!