I would suggest a bobbin winder you can adjust. I had terrible on and off again tension and had wonderful service from my long arm dealer. We could not locate the source of my tension issues UNTIL my bobbin winder died. I got it with my long arm and never really liked it. It was not adjustable and I could not service it. I bought a gently used winder from an online friend. It is not pretty but winds the loveliest bobbins. No tension issues.