So, not only did I post the video, but here's a step-by-step walkthrough on setting the ZS and zeroing the NF ATACR 7-35:
Loosen set screws on elevation knob
Remove elevation knob
Loosen the set screws on top of the ZS upper clutch
Rotate the upper clutch COUNTER-CLOCKWISE to RAISE the upper clutch
Once the upper clutch is fully raised, tighten down the set screws
Replace the elevation knob and tighten down its set screws
You should be able to freely rotate the elevation down up and down from 0
Zero scope to rifle
Loosen elevation knob set screws again and turn elevation knob to 0 so it lines up with witness mark on the scope body or...
OPTIONAL STEP HERE: You can tighten the set screws on the elevation knob and turn down to your desired position below 0 if you want your zero stop to be set at, say, 4 clicks below 0
Loosen elevation knob set screws yet again and remove the knob
Loosen ZS upper clutch screws
Rotate the upper clutch CLOCKWISE to LOWER the upper clutch until it contacts the lower clutch
Tighten the upper clutch set screws
Replace elevation knob, ensuring 0 lines up with witness mark or wherever you set you zero stop, and tighten set screws
Congratulations! You have just zeroed and set your ZS
