Good news is, yes they are adjustable. Bad news is, in 10 years of working on RV's, I can't remember which room system they use, therefore, don't know where it is. Wherever it is, there should be a bolt and a lock nut to hold it.
I think if I was in your shoes, I'd find a qualified tech and have them do it. Then, you can be snoopy and find out what he's doing and ask questions. If it ever happens again, you'll know.
Once you learn the systems that they use, they're not so "magic" any more. If you decide to do it yourself, do it in small increments and check progress after each one.
Good luck!!!