This machine has a drop in bobbin case. I ended up taking it apart to find a dropped needle, and then realised that I should have photographed every stage as I have struggled to put it back together again.
I have an extra piece of wire and I don't know where it goes. It is used to hold a drop in bobbin case in place, but I don't know how to insert it. In the picture you can see the piece of wire is sitting on the right of the bobbin case. I think somehow it gets inserted into that hole and fixes onto the bobbin case from there to stop it wobbling. Any ideas?