Connector/Coupling
Fittings and couplings are used to connect two parts, strips, rods, threaded rods
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Connector
The connectors are used to join axes or rods they are simple or triples -
Arm Crank
Crank arm can be single, double, tapped or not -
Bell Crank
Bell Crank can be simple or hub according to the built model -
Coupling
The couplings are used to join 2 axles rods, a rod and a strip, a rod and a threaded rod between other uses
