First picture, second row, center: Might that be a cam follower for a bobbin winder? The hole in it looks like it might take the pip end of a spring.
The two nuts on the bottom row also look like they might be off a bobbin winder. The only place on a sm that I know of with a square nut is the back of a bobbin winder, on the eccentric screw that holds the cam and cogged gear together.
The spring thing (first pic) might have come from a ruffler, or something like it.