Crane boom smoke generator.
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Previously:
https://www.homemadetools.net/forum/...445#post212012
https://www.homemadetools.net/forum/...418#post162009
https://www.homemadetools.net/forum/...614#post193413
https://www.homemadetools.net/forum/...312#post188635
https://www.homemadetools.net/forum/...704#post151960