Does anyone know how to remove the handle from my shower? There is no hex head set screw whatsoever......only possible way I can determine is to pry off the ss round cover plate, however, I don't want to damage it if that's not the case. I have no hot water , and need to repair/replace the cartridge.

Also, is the freshwater pickup tube going to be located within the area of the hoses next to my manual gauge? I lose prime at 3/4 full water tank, and suspect deteriorated pickup tube!
thanks for any help you can provide.