When that one side sets, it is time for the other side. It is really important to get this right before you glue it permanently I cannot stress this enough. Normally when you set the horzontal stab to the fuse, the fuse is rigid and has very little adjustment. Here the fuse can be rotated either way on that byrofoam collar, the spars can be adjusted up or down and when the byrofoam post is installed, it can be set in there a way to tweek the upright verticle stab. Lots of little things like this that make this plane a challenge to build. I forgot to mention that I temporarily installed the byrofoam post in the verticle stab to help alignment before I started installing the horizontal stab.