Hardi AEON CENTURA TWIN FORCE Instruction Book page 178

6 - Maintenance
3. Horizontally align the aluminium outer wing by adjusting the two ram eyes.
Use a spirit level to check the alignment.
4. Once horizontally aligned the boom, slightly tighten the counternuts.
5. At the same time, adjust the two stop bolts to align the boom
sections.
6. Fold the aluminium outer wing by hand.
7. Check the horizontal alignment at the base.
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