I shot a pic of the control panel... I like control panels. Specially when they work...
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There is a stitch length on the right - to the left of it is a little lever type thing with four markings. You push that in and it selects which disk to use. The big round thing is the width selector. The little one is the needle LRC. In back is a little lever to push when the little lever type thing is pushed and set - it has to be pushed so things will move.