So far I have left the wheel on the car, trusting nobody knows how easy is to just ... take it.
What would you do?
I'd use this my original 1970s CrookLock: it hooks over the steering wheel rim and clutch or brake pedal and locks them together. Not that secure, as it takes about 2 mins for a knowlesgeable thief to defeat it, but more than enough to deter the casual steering wheel thief...
I'm keeping mine for my M3W
I was going to post a link but despite a good search I can't find the device on the web...