I was sewing some breast collars and ran out of bobbin I wound a new one, put it in and it has not sewn since, I believe it is out of time and can't seem to get it back in time. The bad thing is i had only had the machine for a short time and had not really took the time to see how every thing worked to know that everything is doing the right thing when stitching. I have the book on it but it is pretty vague on setting it up. I was hoping I could find someone that has one and could talk them into video taping hand walking the machine through were I could see the parts moving, and that way I would know for sure what each part needs to be through each stitch. i have a union lock but I really like sewing with the american better.