Well, once again the forum came through for me! The passenger seat armrest in our coach had gotten really loosey goosey. Since the DW uses it to corral one of our affection hounds while we travel, it was a subject of aggravation.
I got on the forum and looked up how to remove an arm rest, and with some grunting and cursing I was able to pry loose the plastic "keeper" and remove the arm.
One thing that I had not found on the previous posts was the presence of a bolt to hold the arm rest swivel to the back of the frame. I had been worried that a weld had broken, and knew I would not be able to do anything in that regard.
Fortunately, all I had to do was tighten the bolt, and replace the arm and keeper.
Thanks to all those who have posted solutions to problems that I have not even encountered yet.
Len