Vacuum cleaners need air flow to work. If both valves are closed there's no way to suck the metal piece out.
I never used a video camera, but all that would do is tell you there's something in the cylinder. You already know that.
You might try taping a small piece of magnet to a stick and poking that in there. That would give you more control than the wire I suggested.
Tuesday, June 4th, 2013 AT 10:22 PM