I got a newer Pfaff - a #78 last Friday and I have a similar problem in the same area - the needle will swing to the left but goes to the right in slow motion and sometimes not at all - I have oiled and oiled and it is still slow motion or doesn't go at all. I'm about ready to apply heat and see if heat helps. I've also wondered if I need a more potent cleaning agent than Tri-flow. I can't think of anything else to do.