Great advice Joe. It can apply to many machines, not just the T&Ss. My first 301 kept skipping stitches and just acting up no matter what I did. I probably checked over the bobbin assembly 3 or 4 times before I caught sight of the pieces of monofilament thread behind the base. About an hour, some long skinny tweezers and more than a few choice words later I had removed about 20 pieces of invisible thread.
Cari