I have Deoxit, and need to spray some switches in bottom of my Yaesu FT-101zd. How do I remover the bottom? I tried backing out the small screws holding the bottom on (8 small ones), and so far it doesn't want to come off. Are there other things I need to take off???? If not, maybe I have to "force" it off. I hate to do that, but maybe that's the only way.