Aluminum rudder - elevator connector F 104
Plastic rings are printed on 3D printer (PLA plastic), for elevator you need 10 pieces.
Longer fit in bigger ribs near center of the elevator, round is just for last rib trough come aluminum tube.
For F 104 Starfighter, connection between rudder and elevator is with aluminum part which is custom made for this model. Part is made of high quality aluminum EN AW 6060.
This part is bolted on upper, removable, rudder part.
Plastic rings are rotate around aluminum tube, which is fastened with a screw in ruder - elevator joiner.
Outer ring side is glue in elevator wooden rib.