Yes Janey, got a sample of stitches and I've done some myself, came out nicely.
My spring is the same as in your picture.
Does your cog part turn or is it static please?
I don't have any problem getting it all back correctly, have watched a few YT videos on that.
The pin that goes down the centre of the unit doesn't have a flat end as shown in pics I've seen, I suspect it may have snapped at some point.
Thank you for your time.