Here's a video that may help. All Seasons Mobile RV Repair Awning Removal part1 - YouTube
Use caution when unwinding the spring tension. There are strong springs in both ends of the tube. Both springs need to be wound to the same tension or the awning won't retract evenly.
When the ratchet for my awning broke, I had Grace & Sons RV Repair here in Pensacola replace the spring and ratchet. Reasonable. Owner is Ernie Grace. 850-475-1850 Not far from Milton, Located at 10421 BetMark Lane, in Pensacola, off Ten mile road between Chemstrand and Hwy29.