Singer 90S Manuel D'instruction page 32

6. TWIN NEEDLE SAFETY
needle.
Note: Always select the Twin Needle Safety prior to
selecting a pattern. This will prevent any possibility of
the twin needle breaking.
To disengage Twin Needle Safety and return the
machine to normal sewing mode, either press the Twin
Needle Safety button again or turn the machine off.
Twin Needle Safety is only active when the LED light
under the Twin Needle button is lit.
7. TACKING STITCH MODE BUTTON
8. NEEDLE STOP POSITION SELECTOR BUTTON
When the machine is turned on, needle is set at its up-stop
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