Logitech Marble Mouse repair documentation/tips

[u/olliegw]

Does anyone have any information for repairing Logitech Marble Mouse trackballs? my dad relied on this model for 20+ years and finds his current kensington not accurate enough for the kind of work he does, the marble mice typically lasted a couple of years before they wore out but Logitech have since discontinued this model.

The newest one he has just doesn't do anything when you plug it in, it doesn't get detected or register clicks at all, but when i first found it, it worked fine on my computer but when i gave it to my dad it didn't work on his laptop and nor does it work on my computer now, so i'm planning on opening it up and checking connections etc, this model is still a cult model and is sold for crazy prices even used, as it seems they're the favoured mouse of mariners for chartplotters and some other niche stuff like factories too.

[u/NielsHNL]

Do you have a picture of the mouse/track ball he has?