Anyone on the forum use the Filtec Glide prewound bobbins? I just purchased some at the Houston International Quilt Festival. I have a Handi Quilter 16. The man at Filtec said to remove the anti backlash spring in the bobbin casing before inserting the prewound bobbins. I am confused. I don't think there is a spring in my bobbin casing. Now I am concerned about using them. Any advise?