Are your Corbin Russwin ED6200 key cylinder and Thumb Piece not working?   If so the cams and levers in the Corbin Russwin Active Case Sub Assembly 397F99 are probably worn, stripped or just plain shot!  The Corbin Russwin Active Case Sub Assembly includes are all of the cams and levers, along with the latch bolt, latch bolt springs and slide.   The cams, levers and slide lock and unlock the exit device when the key is used.  This Active Case Sub Assembly is uned on the Corbin Russwin ED6200, the Corbin 3729 and the Russwin 736.  The Sub Assembly is our part # G37240, and is readily available.  If you have questions on this product or any other door product we sell, please call or email and speak to our exit device and panic device experts.

the above image is of the Corbin Russwin ED6200 Active Case Sub Assembly