I went to the football at the MCG yesterday (via train) and after the game I was walking past where everyone parks their bikes on Brunton Ave. I saw a guy riding off without a helmet and picked up some second hand converstation that it had been stolen. I hope the arse that took it feels pretty good about themselves. Anyhow, it raises the question. How do you keep your helmet safe when you can't take it with you? I'm buggered if I can figure out how that little 'helmet lock' is supposed to work or am I missing something?