The thread was done on a Myford S7 converted to cnc with an encoder to do threading.
They are made out or 6082 I think

Didn't do a vid of the thread but had to make a male thread first. The hollow one is being fitted on the end of a spindle lathe to drive the encoder. The pin nut was off the lathe and used that for the fit 35x1.5mm

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https://www.youtube.com/watch?v=MyLwFqa02Bc

https://www.youtube.com/watch?v=ZR_W3w_rews

https://www.youtube.com/watch?v=IiMME9BcBHw