Trying to finish up vertical stab after having to wait for a new aft spar. Picked back up at step 2 and clecoed all the stab ribs to the fwd spar. Began riveting as required in the middle of the fwd spar and worked my way up and down. Finally got a good psi to work with with the flush set and bucking bar. Got one side done except fwd corner where its tight and need to get a smaller bucking bar. Left side partially done and requires 2 people so as not to screw it up with these .016 skins. Going to begin Horizontal until Tuesday when help is available.