The nut on our pivot door started getting a little loose after 6 months of full time use. I simply snugged it back up and put clear silicone caulk liberally on the threads and it's not noticeable unless you know to look for it. 18 more months of full time later and still tight and operating smoothly.
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.