cdnsoldier69 had written this in response to
http://www.sewgirls.com/textiles/Rep...-1540-292-.htm
:

It's all about making sure that the timing is right on between the top and
bottom ends of the sewing maching. As well, you must be sure that the hook
on the bobbin is meeting the needle half-way through the scarf of the
needle right before the upstroke. I'm not sure what it's like on a Pfaff,
but with a JUKI, the timing is easy to adjust by making sure that the two
arrows on the shaft and the belt gear are lined up when the thread lever
is at top center.


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