Hardi ALPHA EVO II EcoDrive Instruction Book page 184

6 - Maintenance
2. If the 1st arm and the 2nd arm are not horizontal alignment, turn
the eye bolt A and B.
When the boom is horizontal position, tighten slightly the counter
nuts
.
At the same time, pre-adjust the 2 stops (C) and (D) between the 1st
and 2nd arms, so that the boom is perfectly aligned
3. Fold the boom by hand so that the 2nd section gently rests in its
brackets on the 1st section
Boom set too low
184
Correct settings
Boom set too high