Bird scaring cannon.
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Previously:
https://www.homemadetools.net/forum/...412#post211894
https://www.homemadetools.net/forum/...845#post198442
https://www.homemadetools.net/forum/...687#post136654
https://www.homemadetools.net/forum/...939#post167935
https://www.homemadetools.net/forum/...800#post159922