taking what you've got Keith,
Mike has said and remembering what Nige has written, it sounds to me it was initially a pulsator with a recirculating jet, they called the pulsator an agitator, then when we see the hole in the wash deck, the jet was dropped and a twin line hose used. The way it talks of a rotary swirls and moving agitator to increase the speed of the water, that says pulsator to me, now if this pulsator was belt driven similar to the twin star as nige says, could the twin star take this design for their washtub, certainly one incarnation of the twin star had a angled base to the tub and a small belt driven pulsator, I've got a parts list somewhere, which contains no drawings it's just a list, showing the washer and spinner have seperate but identical brush type motors, now if goblin used vacuum cleaner motors?
Nothing for it, one of us will have to find one, or preferably both a goblin and a twin star and a........
Even if I'm wrong, it's been great having all these variations going on in my head today.
And another thing lol, knowing how heavy those acme spin dryers are I looked up the weight of the Acme twin speed agitator twin tub, it's 209lb the hoovermatic 109lb, nearly twice the weight of the hoover, and more than twice the weight of the rolls.