Self-erecting tower crane.
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Previously:
https://www.homemadetools.net/forum/...293#post211471
https://www.homemadetools.net/forum/...369#post158254
https://www.homemadetools.net/forum/...459#post142768
https://www.homemadetools.net/forum/...2313#post76134
https://www.homemadetools.net/forum/...024#post115213
