Make sure you have good tension. When I moved my 6600 in my sewing room
I had some problem when using the big cone. Finally DH found that if I move
the thread holder to the side then it worked fine. Now I don't use the thread
holder. I just put one of those cone holders on the back and it works like a
charm.
https://www.poconosewandvac.com/prod...e-spool-holder