Hi John,

To complement the description of Domenico, here is how my KR500 looked like from inside (picture 5&6): http://www.pa3guo.com/kr500.html

I did clean it & apply greece over the balls. A photo of that greece (the brand) you get when you go to http://www.pa3guo.com and click on Rotors, then scroll down.

Not sure if my problem was your problem. What you describe is different, mine was simply stuck. Anyway, all these rotors need some treatment :-) Mine worked fine since then (6 years now).

Succes, Henk, PA3GUO