Planning a trip this weekend and needed a way to keep the helmet with the bike with a little security. Found this product: The Helmet Hook:
http://thehelmethook.com/ that provides a nice, not too costly solution. Can be used to hold the helmet while gassing, or using the custom lock, can keep the helmet from walking away. This is not high security, but rather a convenience.
Bought this from one of their distributors and the lock would not relock after the first opening. I contacted the maker directly from their website and he made everything right with no questions asked. I'm more than pleased with this product.