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13. BOBBIN CASE TENSION
(ALL MODELS)
Adjustment :
1. Remove bobbin case.
2. Insert a fully wound bobbin in case and
thread normally.
3. Remove shuttle race cap.
4. Tie race cap to thread from bobbin case.
5. Hold bobbin case upside down without
touching tension spring.
6. Loosen tension spring adjustment screw (L)
until weight of race cap stars pulling thread
from bobbin case.
7. Gradually tighten screw (L) until bobbin stops
turning.
L
15
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