I don't know if you saw these NTSB reports, William, but they do motivate pilots to do a thorough preflight of the rotor head. It's not unique to Robbies either -- there was a 2000 accident in Canada where the main rotor separated in a B206B JetRanger II) because the mechanics had left off the mast nut, and the accident pilot didn't preflight the ship...
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20070405X00374&key=1
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20050525X00675&key=1
(these new links should work)
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20070405X00374&key=1
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20050525X00675&key=1
(these new links should work)
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