I have often wondered why so-called "white goods" are so expensive... washing machines, clothes dryers, cooking ranges, refrigerators, chest freezers... all are essentially painted or enameled sheet-steel enclosing some really basic (primitive, even) electrical and electro-mechanical parts. Still, I doubt that I could DIY build a washing machine for
@Bluejets $300 target price, even using modern (21st Century) electronics to keep the cost of the human-machine-interface (HMI) down to a minimum at the sacrifice of simplicity. Maybe if I were to salvage the tub and enclosure from a defunct machine I could come close.
The OP appears to want to eliminate the rinse-followed-by-spin cycle and have manual control of the agitator/washing/rinse cycles. This reminds me of Mother's old Maytag wringer washing machine with its "gear shift" lever on the side of the machine...
Everything was TOTALLY manual, including feeding wet clothes through the top-mounted pair of wringer rollers to remove excess water before hanging the wet laundry on a clothes-line to dry in the sun. Water for washing was heated in a manually-filled cauldron set atop a natural-gas burner. A galvanized steel bucket was used to transfer hot (boiling) water from the cauldron to the washing machine tub. This was all "state-of-the-art" in the 1950s, and considered to be a "labor saving" boon for the housewife, who could now put her rippled washboard up on the fireplace mantle, reserved now for use only while playing country (folk) music with spoons and buckets for rhythm accompaniment.
Well, actually, all this took place in Lake Charles, Louisiana circa 1952. We didn't have a fireplace or a mantle in our rented house, but Mom sang and played the violin, and she was quite familiar with the washboard from her childhood, being born and growing up on Bull Creek in Mohawk, WVA in the 1920s.
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I have never thought of Iran as a "third world" country (my cardiologist,
the one who first saved my life eighteen years or so ago, is from Iran and is a graduate MD from Tehran University School of Medicine), so do the people in Iran really need a washing machine invented early in the previous century? No spin cycle? No pump to remove dirty rinse water? No solenoid valve to admit water to the tub? This is progress? Early sewing machines were foot-treadle operated. Gotta wonder if this would work for a washing machine...