You can also use a bike cable through the wire wheel and threaded through the frame. I usually remove the steering wheel. I also made a walnut sleeve to slide over the steering wheel hub to keep the grease off my pants. I have never (while I was watching) seen anyone actually touch anything. Usually if parked in a crowd I hang a sigh on the engine saying HOT. I think also a alot of people have worn out their cellphones. Oh, and I always button up the tonneau when I leave it.