Janome AirThread 2000D Professional - Correct Loose Right Needle Tension; Correct Looper Tension Issues

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Adjusting the Tension
 When the right needle tension is
loose, you will notice these loops
on the bottom of the fabric. To
correct loose right needle tension,
turn the right needle tension to a
higher number.
 When either upper looper tension is too loose or the lower looper
tension is too tight, or both, the upper looper thread is pulled to
the bottom of the fabric. To correct this, turn the upper looper
tension dial to a higher number or turn the lower tension dial to a
lower number, or both.