I guess I'm just dumb and don't understand but why you go to the trouble of installing a secondary bell crank when the modern servos easily stand a balanced load? For several years I have flown pull-pull setups this way with no trouble at all. This includes my 33% Extra 300S (rudder) powered by a Brison 6.4 twin.

Tell me why you don't think a servo alone will do a good job. I'm willing to learn. Is it because you think John will be doing precision 3D aerobatics with his Spacewalker?

Ken