Jan,
If you've not parcelled up the fiddle base Singer 12 for Carl, I'd put a bid in for it as I have a case for it, but my machine was dropped by a child (on his toe, which made me feel that karma was at play, somehow) and it fell down some concrete steps. Sad times.
It may be worth you contacting Helen Howes if you have part machines you need to shift on that Carl doesn't want. She buys, rebuilds or breaks very antique machines for parts. Some of the older parts are getting harder to source, in particular, boat shuttles and bobbins. I have her details if you'd like them.
If anyone would like a treadle 201K in working order but that needs the case titivating, let me know; one seems to have taken up residence here. I know it works, I've sewn two suits of sails on it.