Checking Tensions - Kenmore 1521 Owner's Manual

The easiestway to
check tensions is to sew a medium zig zag stitch on the fabric you
will be using. Use the appropriate type of thread and needle, Use different colors of
thread on the bobbin and upper spool,
Sew a line of zig zag stitches. The bobbin thread should not show on the top of the
fabric,
Adjust the top tension if necessary to achieve the stitch balance as shown below,
UNBALANCED
BALANCED
TOP VIEW
i