I replaced my awning and the spring inside the tube myself a couple of years ago. Like already mentioned, A&E has pretty good instructions. I needed two helpers and it can be done without removing the whole assembly from the RV. Watch the tension on that spring though! I also drilled and riveted the end caps on which worked well.
The hardest part was sliding the awning thru the upper channel. Use lots of soap to lube it up and it can be done but it was a pita.
Scott
Scott
2019 Northwood Nash 24M
2018 Ram Ecodiesel