Self Locking Nut (NyLock) Safety Alert- How to use them, from NTSB
...at Reno Air Races a couple years ago. Here is the general story: NTSB issues five new Safety Alerts And here is the specific Safety Alert article on Nylocks:  ...How is your safety Equipment Mounted? Potential ELT / Antenna Problem
...he emergency locator transmitter (ELT) became dislodged from its mounting tray, detached from its antenna, and failed to transmit radio signals to alert personnel of the downed airpl...