Google water bottle, rubber stoppers, ...?

metal tube can be used...a friend used copper and aluminum tubing , cut it and shoved it into rubber stoppers for water bottles , he stuck them into Rolling Rock beer bottles..straight tube,,,,,no ball......placed at angle like 45 degrees into top of hommade lab type cage with wood and wire top.....(plastic box, wood frame lid, wire screen mesh )...

..anyways......

google , yahoo....even YouTube different stuff you may be able to watch people making them...YouTube has alot of wierd junk in it...
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