Coats & Clark thread isn't made well any more. It used to be wonderful thread, I've been sewing for over 40 years and have seen the changes in thread over the years. I use Gutterman,Mettler and Aurifil threads, they are so much better and give far less tension issues. I sew with modern Pfaffs and antique treadle machines too. The cheap plastic machines just aren't up to snuff; get a better machine, the older machines from the 50-60s are made better and are much less fussy.(getting off the soap box now)
Sharon in Texas