Thanks everyone for wonderful tips. I plan to try them all and find one that works. I don't even know if my machine has a pressure foot pressure adjustment and it's only 6:42 AM so too early to call the Pfaff dealer. For those of you who asked, I am cutting my own logs, and using Aurifil 100% cotton thread top and bottom, with the IDT (walking foot) engaged. Thanks for all your help.