Hi Roger,
It is unfortunate to blend silicone tube and SMA in this way.
Because the fixing nut, which should rotate, cannot rotate, but forces the fixed to remain with the middle mandrel and move with it. The result is that the center pin will sooner or later not connect with the correct torque because it is worn out from a lot of rotation. It is no coincidence that a torque wrench is used to tighten these types of connectors. But for us, it is enough to secure it by hand if it is firmly attached.
The correct solution is when the middle mandrel no longer rotates at the beginning of the thread and the sleeve and mandrel do not wear each other but only slide into it. In short, such an implementation of the idea is unfortunate. If you just want to increase the size of the nut, you have to cut it around there to be able to rotate separately.
73, Gyula HA3HZ
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*** If you are not part of the solution, then you are the problem. ( ) ***
Gyula Molnar