Kenmore Sears 385.16644 Owner's Manual page 27

Make sure that the thread is between the tension discs.
NOTE: If you remove the needle plate, the threading
points of lower looper are easier to see. In
this case, make sure the thread is not caught
by the needle plate when replacing the plate
after threading.
_} Thread
(2_ Tension discs
---<1}
How to thread woolly nylon/polyester thread.
* This is one of the easiest ways to pass woolly
nylon/polyester thread through the lower looper.
* Use the same method for the upper looper.
_1_Lower looper
Ordinary thread
Woolly nylon/polyester thread
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