Hi George, You just have strong hands than I !! Generally when I start rocking something that should come off easily I end up breaking something else.
Separate Question: Inside the RCM box with the small fan do you have a filter on that exhaust port where the fan exhausts into the box? I looked in mine the other day and there seems to be clips designed to hold a filter, but there is none. I can look down that pipe and see the fan blades.