I have an Eclipse motorized awning that won't retract. Upon inspection I found the roller tube end cap cracked and slipping on the gear box shaft. Carefree only sells the whole assembly for $230. This...
Perhaps you could take it off and epoxy the crack together. Give it a light sanding so the epoxy can grip the plastic. Drill a tiny hole at the end of the crack and use a small grinder like a Dremel to widen the crack to a "V" shape for more epoxy depth. It's already broken so what do you have to lose ?