THANK YOU so much for helping me with this simple fix.
I carefully took the cover off, removed the knob, put the cover back on, and adjusted it successfully (almost).
Here's a video:
https://photos.app.goo.gl/J2RWjAgTwUAXYFRb9
I cannot get the vertical to lock completely.
Horizontal seems to behave ok.
Any advice on the vertical?
Edit: After tweaking the AGC, the vertical locked!
Thanks again!