It looks to be complete - there is a long thumb screw in the photo, you need that to attach it. There is also a plate to cover the feed dogs, but certainly on a 201 you can drop them so not needed, and I think they drop on th e99 too.
Those models don't have cams - there is a screw on the left to adjust the length and two smaller screws on the right; one to adjust the closeness of the zig-zag, the pointer will move between L for wide spaced zig-zag, through M (medium) to S (small spacing). The other adjusts the bight, ie the width of the zig-zag. The big screw/wingnut is to move the whole thing through its cycle so that you can start right at the end of the buttonhole and position the needle in the right place.
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