My 4410 has the same dial. I found out after time the metal tab that rides against the dial weakens and allows the dial to change heights while the deck is raised. Talked to dealer who talked to Deere about the design. Nothing ever came out of it and the twenty series was released. I had hope for a design change that one could fit back to my 4410. The parts pages seems to show the same design.
I took the dial off and replaced with two nuts. I keep a set of wrenches in the toolbox in case I need to change the height or remove the deck. Wasn't happy about this at first but found out I wasn't changing the height that much anyway.
Craig