I recently picked up an ancient Singer treadle frame, the cast iron part, and a newer ( I suspect Chinese made ) wooden treadle top at the local sewing machine shop. The cast iron is very dirty and it's wheels are rusted tight. I'm going to put each wheel in a small can of oil to soak then when the weather warms up I'm going to put the two together.
As of yet I have not decided which machine to put in it. I'm thinking of Mr. Lucky. He is a Singer 66-16 that came to me motorized but with a large spoked hand wheel. I switched out the hand wheel for a smaller solid one and he runs much better, but for treadle use I can put the big one back on very easily.
Or, perhaps I'll put my Singer 9W-7 in it while I'm working on repairing it's original base and top.
To many choices ...... I need some Excedrin.
Joe