First cleco and then rivet the parts of the rudder.Cleco:
Rivet bottom parts:
View from top:
The bearing of the middle hinge is not moving free, need to replace the hinge or bearing.
Not happy with the the result of the gusset channel and lower rib, I had to flute the rib to get it straight:
No room for a rivet:
Gusset channel seems too wide: