I know talking about something simple as a switch is boring, but sharing is good
Put the new overdrive switch in, and it's faulty, bought brand new end of last year and it does not
make a connection between the two points.
Also when in place it does not slide up or down easily as it seems to be a bit larger than the old one.
I wanted the old switch namely because the in/out writing is engraved in and filled in with white, as
opposed to the new one which is merely white print.
Best option, refurb the old switch, took it apart,

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Simple design, no wonder it lasted so long with so much use,
a quick clean in the ultrasonic cleaner,

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The plastic ends on the spring can easily be lost, ( done it) found it)
All put together and back in the car, works a dream.