Janome MyLock 644D Instruction Book page 44

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10. Move the lower looper to its rightmost position
by turning the handwheel, and draw the thread
with a pair of tweezers through the hole on the
lower looper 10 cm (4˝) or more.
* Make sure the needle threads are not tangled on
the lower looper.
Lower looper
Needle thread
Lower looper thread
NOTE: How to thread woolly nylon/polyester thread.
* The illustration at left shows one of the easiest
ways to pass woolly nylon/polyester thread
through the lower looper.
* Use the same method with the upper looper.
Lower looper
Ordinary thread
Woolly nylon/polyester thread