Freight elevator door counterweight.
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Previously:
https://www.homemadetools.net/forum/...205#post165406
https://www.homemadetools.net/forum/...443#post162121
https://www.homemadetools.net/forum/...632#post159240
https://www.homemadetools.net/forum/...169#post141583
https://www.homemadetools.net/forum/...834#post140346
