I occasionally will roll my bobbin on the desk next to my bobbin winder to see if it rolls evenly before I put it on to fill. There's nothing worse than having to frog stitches. Had this problem not too long ago as I kept getting eyelashes on the back side. After frogging a number of times I decided too to change bobbins. I took the bad bobbin back to the bobbin winder and wound the thread onto another bobbin so not to waste the thread. I tossed the bobbin out so I wouldn't get it mixed up with the good ones. I don't use the Towa gauge anymore since watching Jamie Wallen's video on his way of checking the tension. It seems to work on my Innova so why what works?