Hope I don't get in trouble for posting this here, but with all the vintage machine aficionados frequenting this section it seems the logical place.
I need the assist spring for the plate to the right of the machine on my cabinet. It's probably the same one as used on the treadle cabinets.
I don't need any of the iron parts, I have all those, just need the spring.
This pic is of the one in my #1 treadle cabinet. The hardware in the 201's cabinet looks the same.