My machine will make a correct stitch on straight sewing however when I switch to a quilt top..that only contains 2 layers of cotton fabric and a thin batting it will not sew regular spaced stitches. Sometimes they are so small and then it will change and go to a larger stitch or at any moment revert back to a small, small very tight stitch. I have done all the regualr things, change needle, both threads are the same, top and bottom, clean the machine...etc. HELP!!!
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