An update - with the filter removed, the lens appears to work beautifully again. Looks and feels right!
That is good news.
I dropped my F2.8 24mm on to patio pavement, it bounced cause it had a rubber wide angle 3rd party hood.
The hood was not damaged and only the aperature ring was slight marred.
Hoods are real useful... contra jour or pavement...
Yes, it works fine. Here is an example. Thanks for your support, everyone.