Zig Zag mechanism not working on Frister and Rossmann Beaver 4?

Please help.
I have a Frister and Rossmann - Beaver 4 sewing machine. The machine can do straight stitches, but nothing else. The needle doesn't move in the zig zag motion. Now that I have thoroughly oiled the machine, I can see parts moving when the special stitch dial is turned for different stitches, this wasn't that noticeable before I oiled it.

What I have noticed, when I opened the top:
What I think is a zig zag cam, there is an elbow arm leading to it, under the elbow of the arm there is a screw with a metal wire tied under it, but this small wire ties to nothing else.

Also with the top off, when you move the width selector to the highest setting which is 4 I notice a tiny hole for which a screw needs to be housed (by the way the width works)

Please note everything else works, just not the special stitches.