Janome AirThread 2000D Professional - Correct Serger Tension Indicators; Correct Loose Left Needle Tension

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Adjusting the Tension
 When serger tension is adjusted correctly, the upper and lower
looper threads meet at the edge of the fabric and both needle
threads are tight in the fabric.
 When the left needle tension is loose, you will notice these loops
on the bottom of the fabric. To correct loose left needle tension,
turn the left needle tension to a higher number.