can't just blame coat&clark threads either... i have spent $17 for a cone of quilting thread at a quilt show to get it home and find no matter what i do i can not use this thread ... i have bought expensive threads in lqs and had problems...i have one machine that will use coats thread, but not superior thread...machines have their own (quirks) when i get one i find my machines wont accept sometimes i can still use them in the bobbins...and for hand work. but when ever i have any problem with stitch quality when sewing/quilting the first things i do are:
take the bobbin out and clean that area, replace bobbin, rethread machine. try again, still a problem, new needle...if it is a new needle then i know it's the thread, and as soon as i change the thread the problems go away,.. 9 times out of 10.