Pictures help. Do you have the bobbin the right way? maybe there is a little lint in there, is the needle in the right way. check your threading again. sometimes different thread helps too. Also check that your bobbin is threaded the right way. I have the manual for a 158 17921 that I am looking at. Has pretty good diagrams. don't know how much difference there is in yours and this manual. I sold the machine and the cabinet it came in to a friend for $5. that is what I paid for it at auction.
Last edited by amyjo; 10-10-2013 at 09:30 AM.