This is weird... M575 less than half the price of the M570.If you find the USB and fix the switches, I wouldn't say no to parting with a few quid, to cover labour, parts and future project tax, if they work mind, my soldering skills aren't up to scratch enough to do anything complex so broken would be no good.
I work therefore I ache: Logitech aims to ease WFH pains with Ergo M575 trackball mouse
Lower back roasting on an open fire, carpal tunnel nipping at your... too early?
www.theregister.com