L-Acoustics A10 Owner's Manual page 86

Rigging procedures
2. Rotate the X-BAR until perpendicular to the front grill.
Use the lodgings as reference points.
3. Tighten the X-BAR.
a) Lift the lever and rotate it counter-clockwise, release the lever and rotate it clockwise.
Repeat until the X-BAR is tightly secured.
86 A10 owner's manual (EN) version 1.1