missing parts

I noticed the other day one of my switches n my ST-16 felt soft or mushy. I know from experience that one particular switch always had a firm positive tactile click. After the flight ended I inspected all of the decorative collars and found others that were loose. If a switch is mounted and...

Under my camera there are four holes on the corners. Two of those holes appear to have a plastic piece in them perhaps holding the camera on? The other two holes do not have this. I added a picture. The blue circle and the one (you can't see in the image) diagonally across from it have these...