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How can I fix my Frister & Rossmann Cub 4 zig-zag?

When I move the stitch width dial on my 1972 Frister and Rosmann Cub 4 machine the needle moves but when I start stiching none of the zig-zag stitches work. What's wrong and how can it be fixed?
Sam, February 2015
link Click here to see other fixes for Frister & Rossmann Cub 4.