Thank you to freshcityfarm for their suggestion of looking at the youtube, "Threading your Bernina serger", what a brilliant suggestion. I no longer have a dark presence in my sewing room, I now have a lovely overlocker that sews beautifully and one I don't want to throw out the window.
I think frustration got the better of me and I just couldn't see clearly. So thank you very much. My sewing enjoyment has returned. Now to get sewing and finally make my garment for May.