Logitech MX Ergo: Replacing the button switches

I recently noticed that the buttons on my Logitech MX Ergo trackball kept causing problems. To be more precise, the buttons would occasionally lose contact while I was holding them down. This led to unwanted effects when dragging and dropping as well as copying text. I therefore decided to swap the two microswitches of the left and right buttons.

After the OMRON microswitches I ordered on ebay arrived, I started replacing them:

1. switch off the trackball
2. remove the magnetic plate at the bottom of the trackball

3. remove the ball
4. remove all six Torx T6 screws
5. carefully separate the two halves of the housing

6. pull the mouse wheel upwards with a little force
7. disconnect all three ribbon cables
8. remove the small circuit board to the left of the left mouse button (1 Phillips screw)
9. remove the bowl for the ball (2 Phllips screws)
10. unscrew the battery holder (3 Phillips screws)
11. remove the main PCB (4 Phillips screws)

12. desolder both switches. I was lazy and simply cut the old switches into 3 parts with a side cutter and desoldered each part individually

13. solder in the new switches

14. reassemble everything in reverse order

All in all, the repair took about 45 minutes and only cost a few euros. The buttons work again as they did on the first day and both the wallet was spared and the environment saved from electronic waste.