I had recently Overhauled my Gieco V3 - I upgrade to OSE heavy duty flex cable assembly, and CNC 7075 prop. I used the provided included (cable assembly locking nut and bullet nut)
The torque after 5+ minutes of running, literally loosened and spun off both nuts ( YES I LOST BOTH MY NUTS! ) :)

I might suggest that a nut with nylon is included instead to make assembly more secure.

And yes i was sure everything was tight before running....