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The branding ring can be removed by unscrewing it from the filter threads.
Once the focus ring is removed, it is extremely important NOT to rotate the helicoid
The index scale ring is also stuck
Remove the three screws holding in the rear mount
Cleaning the stop down mechanics freed it and is now working properly
Install ball bearing and aperture ring
Reinstall the focus ring
Test all functionality
Checking for dust with LED torch...
Individual elements can be removed by removing the retaining rings