I finished longarming a Christmas panel quilt and it was making me even crazier than usual. I was using Mono-poly in the bobbin, and the first 50-55% of the quilt went fine and dandy, the last half was nothing but thread breaks, backlash in the bobbin, and muttered curse words from me. I ended up transferring the bobbin thread to another bobbin and while it didn't entirely take care of things, I'm done! Never again.