Vatech EzRay Air W Installation Manual page 38

3. Installing the Equipment
3.3.1 Leveling the Horizontal Arm
1. Place the spirit level on the position as shown in the following figures.
2. Check if the bubble on the spirit level is placed in the middle.
3. If it is not in the middle, follow the same procedures in '3.2.3 Leveling the Power Box
Assembly: Front/Rear' and '3.2.4 Leveling the Power Box Assembly: Left/Right'.
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Make sure that the Horizontal Arm moves easily. If not, slightly loosen
the wrench bolts.
<Front/Rear>
EzRay Air W (Model: VEX-S300W) Installation Manual
<Left/Right>