Hi Monica,
Thanks for reaching out to embroidery.com! Here's a video that we have on tension, made by our hand embroidery expert Donnett. If you don't want to watch the whole video, she starts talking about tension at about 12:30 on the video. https://embroidery.com/help?
Monica P.
I have used these knobs for several months and they just don’t hold the tension. Is Thera a secret to these