"Lucky you-- enjoy that 66! Is it a back clamper or a side clamper? Mine is a back clamper (1908)".[/quote]
Hmmm....I guess I don't know what you mean by 'back clamper or side clamper".
It is attached to the table in the back. The presser foot lifts from the back, the tension adjustment is on the left of the presser foot arm. The bobbin is round, a drop in horizontal, not the 15-90 vertical bobbin.
Please, fill me in - I'd like to learn what you are asking!
Jan