THis is very typical of the locking mechanisms of that era. We had the same thing happen several times when our motorhome was new. When ours was a few years old I dropped Dometic an e mail asking what could be done to eliminaate the problem. They said in about 2004 they changed the style of locking mechanism.
The earlier mechanism had a fine toothed gear on the shaft and a pointed latching mechanism that was supposed to slip between the gear teeth to hold the awning in place. Because the gear was made of aluminum and the latch was steel the latch actually dug into the gear. The newer mechanism uses a much coarser gear with a latchiung pawl that drops between the teeth.
At that time they sent us a new spring and latching mechanism for no charge. I installed myself in a couple hours and never had another problem. I doubt you'll still be able to get the mechanism at no charge, but it might be worth the effort to drop them a note.
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Hikerdogs
2013 Adventurer 32H
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