On the 99-13, you wind the bobbin with the balance wheel in the stop motion position. Thus during bobbin winding, the needle mechanism is disconnected from the rest of the machine. You probably need to tighten the set screw on the balance wheel. The screw is in the center of the balance wheel on the right hand side of the sewing machine. Hold the balance wheel while you turn the screw away from yourself. (You hold the balance wheel and turn the screw over towards you for winding.)
The manual for the 99-13 is available from Singer on their manuals page: http://www.singerco.com/support/instruction-manuals . The direct link to the manual is
http://www.singerco.com/uploads/download/9d4377811af9ffbbaa1b8efd50ea962c142a66d9.pdf . Look at figure 5 on page 7 (page 4 of the PDF) and then page 10-11 (page 6 of the PDF) for the bobbin winding directions.
I hope this helps.
Cindy Wells
How do I thread the bobbin. I have no instruction manual
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