Baby Lock Sofia BL137A2 Instruction And Reference Manual page 42

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GETTING READY
g While holding the needle with your left hand,
use the screwdriver to tighten the needle
clamp screw.
Install the twin needle in the same way.
CAUTION
Be sure to insert the needle until it
touches the needle stopper and securely
tighten the needle clamp screw with the
screwdriver. Otherwise, the needle may
break or damage may result.
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