Here a couple of pix of my installation in a Brodak Cardinal profile wing.
Top and bottom views. The 1/6" ply, top and bottom, to position
the 1/8" bellcrank pivot during installationon the ribs before the balsa sheeting,
notched into the two center 1/4" ribs. (full body fuse) After sheeting the wing
I put another 1/8" piece on top and bottom after putting the wing in the plane.
Hopefully this helps.
Dave