4x5 newbe here.

The sun is setting last night, and I'm moving my camera to get one more shot- clunk ! Apparently, the lensboard was not secured all the way in the camera, and the lens takes a big ding on the rim. The glass is ok, but the filter threads are trashed.

Can this part of the lens be replaced ? It looks like the glass element can be removed from the outer ring- am I correct ? Who does this kind of work if so ?

Thanks in advance.