I don't know the answer to your question, but keep working on it.
We bought our 1984 310 last June. The wheels that locked the big curbside awning in place were frozen onto their threads when we got it. We hadn't needed the awning yet, so fixing that was lower on my list of priorities than other stuff like keeping the beast running.
Just finished a 2,400 mile trip from Montana to Texas. Passing through South Dakota, had some strong (estimate 50 mph plus) wind out of the south that popped every rivet (there are over 50 of them) and smacked the awning into the air conditioners on the roof. When I finally got off the highway and turned into the wind, the awing fell on the ground, where I left it.
When I mentioned the incident to the postmaster in the next town, Wanblee, SD, I got the feeling that this is not the first awning that has suffered this fate. Not sure whether I will replace. it. If you have loose rivets, stay out of the wind.