[quote=You wouldn’t still have a link to that knob would you?[/quote]
Sorry, no. I bought the knob several years ago when designing an air cleaner for the E-type. Was a happy coincidence that it was a very close match for the knurled design of the M3W switches.
And I do leave the key in place when the car is parked for short periods. With a not so obvious battery disconnect and the general weirdness of the machine I don't work about theft of the car. I do carry a spare key in the tool kit, though, in the event someone nicks the little knob one.
