NASA Termo

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The rigid connection of the antenna parts occurs due to the contact of the conical surfaces in the passive part and the rigid stop in the active part.During the action of overloads and vibration on the system, the rods are held in their original position by split cylindrical bushings. Before activation, volumes containing ceresin must not be heated above 60 degrees.The movement of the cone occurs due to the pushing of the rod from the volume with ceresin when the can is heated to 80 - 100 degrees...But there is a peculiarity in installing the antenna.Installation before the cables are completely tightened must be carried out on the shady side to protect the ceresin from heating.After pulling the cables, the antenna must be turned with its back side towards the sun (I think this maneuver is not difficult). After some time, the cans (specially black) will heat up and the rods will take the extreme position until they stop. The cones will be tightly wedged.The taper angle is guaranteed to provide a frictional force greater than the possible breaking force. The material of the cone bushings is mild steel.A split cone bushing can significantly reduce the requirements for the accuracy of manufacturing cone surfaces.When the cones of 5–6 mm intersect each other, surface contact occurs and slight deformation occurs. After some time, diffusion welding may occur.The total weight of added parts is less than 150 grams._____________https://en.wikipedia.org/wiki/CeresinPictures 1 and 2 show a car thermostat that works according to the described principle.