Clecoed skin to spar and beginning with setting rivets on counterbalance skin. Counterbalance skin "under" or "over" rudder skin?? Did Web search - skin goes over counterbalance skin. Plans say to bevel (??) edges of counterbalance skin. Not seeing any difference or bending of rudder skin. No marks or 'line' where two surfaces meet. Double checking when replacing rivets. Put two rivets in before attaching rib - need to remove. One rivet only got edge squeezed by squeezer, bent over, need removal and replacement Setting up and removing rivets took 1.5 hour!