I have on mine, I use a spring thingie that fits right on the needle bar not the foot bar. It works pretty good but I use the same color bobbin thread as the top thread in case of any looping. I tried putting one of those magic bobbin washers under the bobbin but it did not work, it made it worse. I prefer to use the 15-91 for fmq but you can use your 66.
Gwen