Dad is having trouble with a 4730 wanting to fold the entire boom at the same time.  Instead of the outer section folding first and then the wing folding in toward the cradles, it tries to do it all at once.  He understood from two techs today that there is a sensor that is tripped by a magnet on the end of the rod inside the cylinder.  They both said they have had issues with the magnet falling off or breaking in the past, causing this problem.  Does this sound right and if so how hard is it to tear the cylinder down and fix or replace the magnet?  Thanks in advance.