Originally Posted by
sycamore
The spider/slider have splines matching the mast-splines, but it is difficult to determine if there is a lock-nut at the end of the rotor mast as well.
The spider slider isn’t splined on this aircraft type. The scissor links transfer the rotation of the tail rotor hub to the spider.
Yes, there is a ‘nut’ holding the tail rotor hub on (there is always a ‘nut’), though it doesn’t look like a nut in the conventional sense.