The black plastic is part of the component. They are called "SMT Chip Capacitors". The one way to quickly remove the base from the canister in a destructive way would be to overheat the part so that it bursts and spews out the dielectric while you are extracting it from the board, as I have done in the past. Don't worry, though, it's unavoidable. By the way, if you don't have the proper desoldering tool tip for removal of these caps, I'd go the other route and use two pencil soldering irons of 15 Watt rating to remove the caps. It really does work...."still not totally sure about doing the soldering myself. the current cylindric capacitors are seated in a little piece of black plastic. when removing the old capacitors, does the black plastic part come off as well? if you have any pics of that process, that's what i'd like to see."
thanks a bunch,
ortencia