Hi Gary. They use an electronic "popper." Actually it's a selinoid on a remote swtich. When the right button on the remote is pressed the selinoid pops the hatch open. It's the same thing that is used when door handles are shaved.[8D]
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Enjoy the cruise.
Don aka Basset Hound
Pics at: http://members4.clubphoto.com/don284358/
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