PNI BPL505S Manual De Usuario página 9

Fig.9
3. Loosen the lower linkage nut (21) and remove the upper linkage nut (20).
Turn the manual release handle (6) to the open position and pull out the
adjusting insert (22). Turn the manual release handle to the closed position
and stop when the boom has an inclination of 30 ° - 60 °. If the boom
is going towards the open position, the spring nut (18) should be slightly
loosened or the number of springs should be reduced. If the boom is going
towards the closed position, the spring nut should be tightened or the
number of springs should be increased.
Fig.10
Tighten back the upper and lower linkage nuts after making all other
adjustments.
9 User manual