upgrade head warning
the head upgrade for the walkera 36 and 60 has a weak point on the ball links to the blade holders.
the coller that goes over the blade holder is held on with a cross head screw and in a crash the coller turns on the holder, this should not occur as there is a flat on the holder to position the coller in place.
due to the soft alloy used the coller turns and if your not aware of it happening the result is a drastic pitch change resulting in no lift due to one blade being 10 degrees differant from the other.
the ball link coller needs to be locktite’d in place and care must be taken to ensure both holders have the same ball to holder oriantation.