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If your getting all that striction, it would likely be that the worm is cranked down hard against the ring, where normal operation has the worm just mated with the ring grooves without pressing hard against it. If you read the old Cloudy Nights threads, some of which i have had input to, you will find details on adjustment. Honestly, that should be able to be fixed in five minutes with the adjustment screws. The original CGX manual had details at the back on worm adjustment.
I have to ask, did you buy this mount new or used? It would be highly unusual for a new mount to come from the factory not correctly adjusted. There were a few early build models that had QA issues related to set up, but those were sorted out years ago.
You might have a clutch problem, but I have never heard of that in the CGX ( where the clutch does not release completely with the lever). If the mount swings freely with the clutch released then look to the worm and ring binding. You should be able to move the worm with your hand, compressing the load spring to pull it away from the ring, if the worm cannot be moved then the range screw is not set correctly.
The only other thing I can think of is a seized drive motor or transmission (each motor has a small transmission at the end where the drive belt sprocket shaft is located). I have not heard of a failure in that area.
If we were not in represent travel lockdown, I would suggest you bring the mount to my place and I could investigate and adjust to correct settings.
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