So, let's get to it. You will need to purchase Rear View Mirror Glue from your local auto-store and it's only about $4. You will also need a flashlight, pair of latex gloves, some isopropyl alcohol, paper towels and dry erase marker.
Step 1: Sanding the metal button
There is a disc sander in the metal shop, which can do this job perfectly. In the photo below the disc is actually spinning, but flash created a "stop action" effect. Second photo shows what the surface looks like after sanding.