Dometic™ A&E 3310420.017U RV Awning LH Torsion Arm Assembly - BlackDometic A&E 3310420. 017U RV Awning LH Torsion Arm Assembly Black This is a replacement torsion arm assembly for the Dometic A&E 9100 Awning. The torsion assembly has a wound coil spring which provides tension on the roller tube to roll the awning up into the travel position. It includes the complete left hand end assembly, including spring, rod, pin drive, and top casting. We pull these from new awnings that we part out. They may have scuffs.