Was it part #7 at this link
? A few years back I did that once while closing the awning in the dark. Turns out I got the 'C' misplaced onto the wider base of part 3E. Should have realized something was going wrong the way the rollup tube stayed up high and out from the trailer. You can temporize for travel with some zip ties, but you're done deploying the awning until you get the replacement part.
I called my local Airstream dealer and they had one part in stock. ZipDee is one of those amazing service companies. Bet if you give them a call that you could have the part by the end of the week. Installing the part was simple.