[Bin Sun]’s build is based around an old ball-type PS/2 mouse, the kind with the nice optical ... mice is a nice trick to file away for a rainy day. Or you might prefer to just build your ...

The 5620 mouse is still the most comfortable mouse I’ve ever used. I had a couple of 3B2’s and a stack of 5620’s in college… But only one real mouse. However I had a pile of old 3B1 mice ...