SINGER W951 - Manual (Page 9)

TO THREAD THE BOBBIN CASE
Fig. 10
For best sewing results use only evenly
wound bobbin ”A” (Fig. 10). Do not use
bobbins as illustrated by "B" or "C".
Fig. 11
Hold bobbin case between thumb and forefinger of
left hand k ) that the slot in the edge of the bobbin
case is on top (Fig. 11).
Take the bobbin between thumb and forefinger of
the right hand so that the thread on the bobbin leads
from left to right and extends about four inches from
the bobbin (Fig. 11).
TENSION SCREW
Fig. 12
Insert bobbin into the bobbin case. Pull
thread into slot in edge of case (Fig. 13).
and draw it under the tension screw
(Fig. 12).
-8 Fig. 13