Could be a issue where the spring is attached on either end. I had an end cap strip on the shaft due to very poor mechanical design. Or the spring as you suggest.
2 people and ladders, revove roller and canvas, then remove canvas, install roller unless you can carry it elsewhere and secure with rope or other means.
I had a awning blow off driving in the wind. Awning, roller and parts of the arm sailed across the highway.
2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland
Bob