Like loose on the post? I wonder if a little piece of tin foil would fix that?
Yes, on the post. When I have them up, and lower them slowly by hand, I can see the other end of the arm rotate on the post, as the spring pulls it. It can't come off since the lock is in place. I wonder if the splines in the arms are simply worn out, or maybe my replacement wiper "transmission" has undersize posts and I just never noticed it before. I had to replace it a number of years ago, and I think the replacement was a Dorpoop.
Tinfoil, would be interesting. Maybe I'll try it. No time today, Though.