Originally Posted by
miriam
What have I not tried on the one that sews tunnels?
I've cleaned and adjusted the tension - top and bottom - it feels right and looks good straight stitch but just in case I loosened to no avail. I adjusted the feet pressure thinking it was too tight or too loose - I like where it is right now. The eccentric has been adjusted and I checked for burrs. I also used different fabric - works fine on heavy stuff.
I'm wondering if it's something more obscure like the cam timing.... Did you check that?? I think back when I was having trouble with that 431, I posted a similar question and I found that the hook timing was a smidge off as well. Not enough to do much as far as skipping stitches but enough to cause tension headaches? It's fuzzy though, I may be mis-remembering.