Janome AirThread 2000D Professional - Adjusting Upper Looper Shaft Height; Check Upper Looper Shaft Clearance; Adjust Upper Shaft Height

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Adjusting Upper Looper Shaft
Height
 If an adjustment is needed, loosen the 2.5mm hexagon screws and
move the upper shaft up or down to obtain the 1.2mm clearance.
Tighten the screws.
 Turn the handwheel towards you to bring the upper looper shaft to
its lowest point. The clearance between the upper looper base and
shaft guide should be about 1.2mm.
Upper looper base
Upper shaft guide
1.2mm
2.5mm hexagon screws