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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,633
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At my old house, I had one of those canned air horns mounted by the back door to the garage with an angled bracket screwed to the door, positioned so that if the door opened about 2 or 3 inches, the bracket on the door would press the button on top of the air horn.
This only works on a door that is not used.
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