Don't have a Nolting, but know that the manufacturer is a good one, so be sure to call. Are you using batik? I had a big batik quilt on my Gammill and kept shredding thread--had to REALLY loosen the quilt on the frame and it solved the problem. also have had some shredding in past when needle not totally centered. And have also had shredding when the thread slides off the cone too fast and then puddles around the cone holder and gets hung up(and if I don't notice that, when I re-thread it has often pulled the thread out of the intermediate tensioner)--that only seems to happen if I'm using something like Glide or Magnifico, etc. Just some things to check.