Sputnik 1 was filled with nitrogen to detect damages by micrometeroites causing a leak and a pressure loss. Therefore electrical vacuum feedthroughs were needed to connect the antennas to the transmitters.
Sputnik’s antennas consisted of four whips attached to the aluminum
enclosure through insulators that were spaced symmetrically around the
On the rocket, it's going to be a sufficiently reinforced piece of the vehicle structure. I've attached a photo I took of the Saturn V in Houston with the relevant hard point on the first stage circled. Note in particular how thick the block of metal that gets clamped down is, and note its structural connection as it goes up the length of the rocket.
edit : Apparently it is called an "rod end bearing"
edit 2 : As mentioned in the comments it could even be a Clevis joint.
The place where the green rectangle in your diagram touches the blue rectangle has a ball and socket like joint. This prevents one actuator from blocking the movement due to the other actuator.
Above picture from blog.nasa.gov ...
A longer version of the animation provided by the China National Space Administration and released by China Central Television, can be seen here, starting at 0:32.
It appears that the ramp was stored under the wheels in transit, with both ends folded upwards, and it unfolded, slid out from under the wheels, and was lowered to ...