520-ton bridge crane hook block.
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Previously:
https://www.homemadetools.net/forum/...490#post154908
https://www.homemadetools.net/forum/...441#post158477
https://www.homemadetools.net/forum/...369#post158254
https://www.homemadetools.net/forum/...2313#post76134
https://www.homemadetools.net/forum/...459#post142768