Thanks for all the replies, guys. My wife and I both have HJC IS-33 matte black 3/4 helmets, and I had just figured out how to hook both of them onto the little latch (more for the wife's piece of mind than mine)
Arteacher, I'm sure you're right about how weak the stock one was anyways, and I love the link you posted! I'l either consider one of those or just a plain jane cable lock since they are cheaper.
I have a monster of a sissy bar with no shortage of places to lock or mount stuff. My family tends to call my bike the "Pope-Mobile" since it looks like a cathedral piece.
Youzguyz, to go with your bright little ray of sunshine: I was so caught up in the discovery of my missing lock that I left the key in the on position for about 6 hours before the father-in-law noticed and told me. I topped off the acid and put it on a charger, but I'm fairly certain I shot it. Unloaded voltage was only around 9.5 and steadily declining after a 2 hr ride.
Oh well... Just an excuse to get a gel battery and remount it for better use of my space!