DIY fix Logitech MX Anywhere 2 ghost double click / left click / defective mouse button.

My otherwise great MX 2 mouse started randomly double-clicking when I tried to left click. A defective microswitch was the cause.
You will need:
New Omron microswitch type: D2FC-F-7N (about 3 US$)
Soldering iron / wire / solder
Phillips head screwdriver
About 45 minutes