How to properly attach a HV cable to the X-ray tube
The following are excerpts from the 08538 Quick Start Guide: X-ray Tube Installation section.
Apply HV Silicone grease:
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Tighten ring nut using hand and 1.5mm hex key per image and video below. Stop when the ring nut flange is 3mm from the HV receptacle:

How to tighten HV cable ring nut: