When I posted about this last, I had a rescued White treadle base and head. The tension piece on the front plate was badly rusted and I was given another head for parts. The problem was that they didn't interchange. It turned out that the original head was a Japanese White. I wound up with a third head, which looks nice in this base and sews!
Now onto an electric White that needs cabinet and electrical work. And I got a Singer 28, that will need a base. And then I will need more room for all these sewing machines