Your sewing machine mechanic is wrong! When Mike Furry set up Sun Path his production floor was almost entirely 20Us, using e thread. He and Red Payne convinced me that it would be the best machine for my loft for general repairs. I'm glad I listened. The 20U I purchased new in 1984 is still running great, has never seen a mechanic, and I wouldn't part with it. I have used it for canopy repairs, container repairs, quilting, and heavy canvas projects. With the right thread, needle, and tension this machine can do just about anything!