Originally Posted by BonnieJP

I sandwiched some batting between a couple of fat quarters to test the tension. I sew a little, adjust tension a little, sew a little, adjust again if necessary until the tension is perfect. I do not play with the bobbin tension, only the top tension. Some Juki owners swear by the Towa tension guage for fine tuning the bobbin tension, but I have found my test sandwich works just fine. Jamie Wallen also has a YouTube video (Taking the Stress out of Longarm Tension) that provides tips on adjusting the bobbin tension on a longarm machine.