Fig. 10
and snap pins " Z " back into place (Fig. 9).
Insert bobbin case, replace needle plate (as shown in Figs. 5
and 6) and lower the machine to its working position.
Adjusting the thread tensions.
The tensions of upper and lower thread are correctly balanced if
both threads interlock in the center of the fabric, as shown in
Fig. 12.
If the tension of the upper thread is too strong in relation to that
of the lower thread, the lower thread will be pulled up to the top
surface of the fabric and appear there in the form of small knots or
loops (see Fig. 13).
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