Worker precisely filling two bottles at once.
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Previously:
https://www.homemadetools.net/forum/...005#post187379
https://www.homemadetools.net/forum/...644#post186135
https://www.homemadetools.net/forum/...742#post178754
https://www.homemadetools.net/forum/...972#post164399
https://www.homemadetools.net/forum/...097#post160868