No the jamming is when the thread gets jammed or caught in the bobbin area. I think I have solved the problem though. I went the weekend and purchased a new bobbin case. Which cost me $10. I WILL NEVER TOUCH THE SCREW ON MY BOBBIN CASE AGAIN!!! The guy at the sewing maching shop also told me that with the insul-brite I need to make sure to keep the machine cleaned often and all of the other advice above that was given to me. I also ask him about the timing. He told that if my stitches aren't skipping then it is not the timing. This was great news. So far so good. Thanks for all of your help. I have learned alot through all of this.