Janome AirThread 2000D Professional Service Bulletin page 47

Needle Guard Clearance (front)
0 - 0.05mm
The clearance between the needles and front
needle guard should between 0-0.05mm.

Install the front needle guard, move it closer or away from the
needles to obtain the correct clearance. Hold the front needle

guard in position and tighten the 2 screws. Be sure the guard is
not positioned too high, otherwise the chaining finger will not
work.
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