It really struggles with the load when sewing down the seam line with the batting and backing (like it's having a hard time piercing the fabric). It does pretty well in the open areas where there are no seams. Is this detrimental to the machine?
Do you think changing to another 401 or to one of the 503s would make a difference? I used new needles, so changing needles won't help.
The other option is to change the plan on quilting, which won't hurt anything. I just thought the twin needle thing would look good for a change.
bkay