Baby Lock BL9 (BL9) Instruction and Reference Guide - Manual (Page 28)

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Reverse Stitch Button
As long as you keep the reverse stitch button
depressed, the machine sews backwards.
Darning Plate
To set the darning plate:
Position the darning plate with the 3 pins on the
bottom.
Fit the darning plate pins into the needle plate holes.
The feed dogs will show through the darning plate
holes.