Help me out... I rattled another nx8

Is this setup fixed affirmly? I always cringe when I see a bow or rifle strapped tight to a gun rack. No give, no cushion, that's rough on anything.
 
Is the set screw for the zero stop vibrated out and rattling inside the scope cap? Just curious. I recall that happened to a Mod here so now I carry the small Allen wrench in the gun go bag in the truck.
 
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