with the forward spar bolts located and reamed the lower stab angle bolts were counter bored , then drilled thru just under 1/4 , then reamed thru 1/4 and the angles bolted up snug.
with every thing locked down the lower angle holes were located , scrap of 1/16 ply placed brehind for skin spacing and drilled thru hard point.
Disasembled everything and clued the stab in place , forward spar glued in with T-88 and bolted up. Aft spar was set in a bed of T-88 and micro . This was needed do to the slight angle cut into the spar . Locked the rear spar angles down and cleaned up glue seep as the stab set.