on you Gammill, the little loops on the bottom may be caused by the need for a new bobbin backlash "spring" (the little metal thingy in the bobbin--and remember that the Gammill bobbins use a different backlash spring from the Towa bobbins). I've also been told that it may be caused by the check spring having lost it's springiness--so change out that too. My tech had told me that if you quilt pretty often, the check spring needs to be changed about every 12-18months.