Pfaff coverlock 4852 Owner's Manual page 23

Thread the thread guides which are marked
with a violet square in a sequence of 1 to 9.
Thread from the front through eye C of the
two thread chainstitch looper and the cover
stitch looper (= threading point 11).
Push lever A upward and hook the thread
into slot B. Also refer to the drawing below.
Note:
The lever returns automatically to its
position as soon as you start sewing.
Pull approximately 4" (10 cm) of thread
through the looper and place it to the left
under the presser foot.
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