Blender Pilot responded ..........
qmark,
Lots of things can be installed backwards on helicopters, just yesterday I flew an L4 with the lift links/transmision supports installed backwards! Sure freaked out when I realized it! I have also seen bolts on pitch links, blade retaining bolts, and even T/R control cables on a Lama! Unfortunately this things happen way too often everywhere, and my advice is to be extra careful and check everything really good after the helicopter has been put back together!
About a year ago, they were making a runup on a Jet Ranger after an overhaul when the rotor head flew off and landed 1800 meters away on top of a school! Somebody forgot to tighten/install the "jesus nut"! Who would you blame the mechanics or the pilot?