I used two pieces of 1/8" steel angle, bolted onto each other like a double L and taking the counterweight on one arm and clamping the aileron spar between them on the other. As long as would fit behind the rear spar.
John Martindale Family 29 Jane Circuit Toormina NSW 2452 Australia ph: 61 2 66 584767 email: johnja...@optusnet.com.au