Complete installation of ribs in elevator and horizontal stabilizer. Tacked all of the ribs in place first then installed the surfaces on the plane to check alignment. Had to readjust a few ribs, then removed the surfaces to Hysol all the ribs in place. This was due to installing the ribs next to the metal ribs in two locations,as directed, on the stabilzer. The metal ribs on the elevator interfeared with this location so I just relocated them slightly so that all the ribs in both the stabilizer and the elevator aligned with each other. Also installed first coat of Hysol filler on the tips.