Thanks, folks. I have checked the needle to be sure it is inserted properly, checked the bobbin winder mechanism, and everything else except for the correct bobbin size. I will verify the correct size & if it still doesn't work, off to the repair shop I go. I have done everything else I could think of. You guys are so terrific and I REALLY appreciate how you are so willing to try & help each other out. Even though we have never met (to my knowledge) I feel as you are my personal friends. Many thanks. I'll post an update of the outcome.