Step 1. Remove the nametag (inside the mic clip slide). You'll see a screw which holds the back end on. Remove the screw.
Step 2. Remove the back end assembly of the mic.
Step 3. Inside the body (possible covered with a dab of silicone glue) is a 7mm nut.
Step 4. Remove the 7mm nut and the whole mic will come apart.
Step 5. Fix the screen and reassemble in reverse order.