Step 1: The tools needed to open up an Apple Pro Mouse (Black) will be [1] Exacto Knife and [2] Spudger with one Flat end and Pointed end.

Step 2: Where to cut the glue points shown in RED to remove the Clear Top of the mouse.

Step 3: Cut the Cable Reinforcement lengthwise as shown in the picture. This will allow the reuse of this piece when you have completed the repair.

Step 3: You need to detach the Black Ring from the bottom up past midway. This will allow access to remove the Clear Mouse Tray.

Step 5: Inner Clear Tray completely removed from the Semi-Transparent Black Case. Careful not to damage the cable attached to the connector on the PCB board shown in the second picture. Two cable wires were repaired by soldering them back together.

Step 6: Remove the Black Cage off the two nubs carefully. This cage covers the Red Laser and hides a clear plastic film with a rectangular white square. The white side facing the laser has a textured surface which I was unable to capture. If you lift the lower bottom edge of the PCB board you can slip it out from the Clear Tray.

Final Step: After reassembly this is the Apple Pro Mouse being tested showing it's Red Laser light working. Be mindful that the when reinserting the assembled Clear Tray back into the Semi-Transparent Black Case that the top lip must sit properly into a ledge/nook in the Black Case or the click will not work.