I just sold a sewing machine to a lady. Her little girl was wanting to learn to sew. I showed her how to untangle a bobbin thread by taking off the parts. I showed her how to clean it all out and put it back. The lady looked at me wide eyed. She had a machine and got rid of it because she didn't know how to do that. I showed her how to put the bobbin case in. She didn't know you have to have the lever and the needle in the up position. She commented that if she knew some of that she might not have sold her old sewing machine. Some of it is so easy yet people don't look in the manual. OSM don't take time to show people what is causing their messes. They just charge an arm and a leg, pat you on the head and smile when you have to go back.