My sewing machine had been making a funny sound all of a sudden. I changed the needle, re-threaded it, dusted it with no avail. I left a message for my sewing machine repair guy to call me. Since his mother is in the hospital I could not reach him this weekend. So today I had a light bulb moment. I bought more gutterman thread. I changed the needle again and this time the thread as well. Now she purrs like a kitten. So the thing I learned about my machine is that she does not like coats and clark thread. Bad thing is that I have a lot of coats and clark. I checking the thread weight on the coats and clark. However the weight is not listed on what I have, except for the spool that was on it. It is 35 weight and the gutterman cotton that I am using is 50 weight. So my question is this, Is the higher the number the lighter the thread? Because that is what it feels like to me. And no, the 35 weight is not hand quilting thread, I checked that first. So I guess you could say that my machine has expensive taste in thread LOL.