Step 1: Order/obtain replacement lens mount
Step 2: Prepare tools and workspace
The only tool needed is a small philips screwdriver. I placed everything on a large sheet of white graph paper to be able to see the screws more easily. A cup or saucer to hold these screws is a very good idea. Pictured is the lens, screwdiver set and the replacement lens mount.
Step 3: Remove 8 screws holding lens mount in place
Step 5: Rotate CPU contact plate in, and pull mount out
Step 6: Unscrew bad mount from white wire
On the replacement part, unscrew the same mounting bracket. you only need one, so use the one that is still attached to the lens. Screw the bracket to the replacment mount. Verify that the new part is attached to the lens and the old part is not. You'd hate to have to do this all over again.