When installing partial rib #2 PN 27023 (mine were stamped 27022) under the fuel tank, instruction says to trim to fit around aft edge of fuel tank, fabricate shims from scrap stringer material (wood) so that the the bottom cap strip of partial rib conforms to airfoil profile of #1 and #3 ribs. Bond partial rib to rear spar and shims to fuel tank. The instructions say nothing about attaching partial rib #2 to the front spar (too short to reach) nor to the shims. The illustrations do not show any such attachment. Is the front of the bottom cap strip of partial rib #2 intended to free-float? Should it be bonded to the shims? Should the shims be applied at more than one location along the bottom cap strip?