speaking of ball bearings. (and certificated parts/aircraft) Especially wheel bearings for light airplanes. Do you actually believe there is some guy on the ball bearing line that tests every bearing & then decides if it is 'aircraft quality'? I mean, come on! the wheel bearing in your car sees much more abuse and lasts much longer than the one in your cessna 172, but? they are "higher quality" (and price). Some things are just not to be questioned, i guess?
Back to the th-55 now. The TT-strap in the tail rotor is substantially life limit reduced when you "civilianize" it. Why? well glad you asked. Only reason i can see it that the military has increased the pitch that the pilot can put into the tail rotor, hence stressing it more than was allowed in the original design. So? if your strap has seen any "military time", need to replace it with new and re-set your stops.
OK, i'm done. Dog house duty calls.