Dometic 9100 Power Awning Problem

[MPI_Mallard]

I recently had a local RV company replace my awning and
when they started they didn't loosen the knobs on the lower part of the arms causing the square nut to jam against the aluminum track, when I pointed the damage out to the installer he "fixed" it after which the awning retracted as it should. Later I extended the awning and the square nut caught the inside of the track where the nut had dug into it literally forcing the knob's bolt to rip out of the end. The RV company gave me the repacement parts which I installed and now when I retract the awning the bottom of the arm sticks ou a couple of feet instead of folding up against the RV's wall. i called Dometic and they have never seen this and neither has the installer whith his "so-called" years of experience! Any thoughts????

Thanks In Advance,,,