Riveted HS-810-1 and HS-814-1 to the front spar channels. Care was given to ensure the factory head of AN426AD4 rivet was on the aft face of the spar. At times if found it necessary to partially squeeze the rivets, stop to adjust the rivet squeezer, then finish squeezing the rivet. This was especially true around the lower reinforcement bar. HS-404 and HS-405 ribs were then fitted.
