Janome AirThread 2000D Professional Service Bulletin page 52

Adjusting the Position of the Tip
of the Upper Looper
Turn the handwheel towards you to bring the
upper looper to the leftmost position. Insert the

upper looper gauge onto the upper looper shaft
Push the gauge all way against the upper looper shaft then slightly
push it up until the bulge of the gauge touches the upper looper pin.

Rotate the upper looper until the tip of the looper is aligned with the
guide line. Tighten the 2.0mm temporarily. Remove the Gauge.
Guide line
52