Triple screw pump.
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Previously:
https://www.homemadetools.net/forum/...740#post167337
https://www.homemadetools.net/forum/...244#post141921
https://www.homemadetools.net/forum/...495#post189393
https://www.homemadetools.net/forum/...888#post179360
https://www.homemadetools.net/forum/...946#post187164
