Originally Posted by traumaRN
I have used Guterman, Dual Duty, and Mettler in mine without any problem. I really don't think it matters, it's not the thread, it's the tension on your machine.
I agree. I've had no problem with these on my FW.
Check T-N-T or Threading, needle, tension first. Clean your FW. Then check your timing as it may be off.
ali