SINGER 1 ONE Plus Instruction Manual - Manual (Page 32)

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6. TWIN NEEDLE SAFETY
When using twin needles, press the twin needle safety button
regardless of the stitch you selected. Doing so will reduce
the stitch width automatically and save broken needles and
possible damage to your machine.
When the button is pressed, the LED light under the
button is lit, indicating that Twin Needle Safety is activated.
When turning the Stitch Selection Dial, the machine now
automatically skips all stitches that are not suitable for twin
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
Press Tacking Stitch and the sewing machine makes 4 tiny
fixing stitches to tie off the sewing on all patterns.
Press Tacking Stitch button when the machine is stopped
so tacking stitch will be activated, the position of the tacking
stitches will be at the exact spot in the pattern where the
Tacking Stitch button is pushed. When the function is
activated, the LED light under the button is lit red.
8. NEEDLE STOP POSITION SELECTOR BUTTON
When the machine is turned on, needle is set at its up-stop
position with upper LED light lit. When the button is pushed,
needle is set at its down-stop position with lower LED light lit.
Push it again and it will return to its up-stop position with upper
LED light lit.