Gas cylinder launches like a rocket in junkyard.
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Previously:
https://www.homemadetools.net/forum/...473#post142839
https://www.homemadetools.net/forum/...608#post139591
https://www.homemadetools.net/forum/...568#post117613
https://www.homemadetools.net/forum/...616#post102044
https://www.homemadetools.net/forum/...479#post117039