Just installed a Trutrak roll/pitch
in an RV-4 ---- Jesse, I just used the install kits and drawings/pics that Trutrak sent me ---- I had previously installed one in my -6A, so, although not the same airplane, not that much different as far as the technique -- I put the -4 roll servo on the rt. side --- of course you have to cut the notch in the floor member, but the Trutrak drawings showed it clearly.
Ron