Today I replaced the switch...with success! Yeh!
It was an easy task, except for removal of the two screws that fasten the switch in place. Getting them out was a nightmare...took an hour. Back in was easier, only 30 minutes. Very fiddly.
A few tests without a drive so far. Fast and easy removal.
Berrys gave me the switch. I'm guessing it's worth their while to avoid that wee pita task themselves. Grateful for the freebie.