Interesting
Rose B. had a Multi-matic with the "Clock" control dial, and her Mom Mary W. came to live with her. I held my breath at the site of the navy speclked tub because it looked like an automatic Friigidaire with its frame removed. I asked Mary how it worked and she said you push the pulsator down to make it wash. Being a little boy, I kept saying How. A helfy pretty woman with a strong melodious voice, she led me right over and showed me a metal ring surrounding the shaft which jingled a little, she pushed it and it clipped. Unfortunately the machine was not "Hooked up"--as much as you can hook up a wringeroanyway, but was off against a wall, since Mary had been using Rose's Multi. A One time deal, have not seen or heard of Frigi Wringer since. I'm sure someone else has.
Maybe Geoff knows
Footnote: the original pulsamatic pulsator, as distinct from the unimatic, has a solid head, no cap, no opening, no jumping water, no dispenser, just the slits of a Phillip Screw. Ladies and kids forgive me, bit it is unmistakeable because it is jet black, narrower on top than any other pulsator and looks like the head of a penis.