Uh-oh, I was afraid you were going to say that. That lock (Kewlock) is incredibly convenient, unfortunately I went thru two in about three months last Fall. The first broke unlocking my helmet and Kuryakn replaced it. The 2nd broke with my helmet firmly locked in place about 40 miles from home on the Friday of the Labor Day weekend. The wife was none too pleased to drive an 80 mile round trip to bring me some tools to get the lock/helmet off. I gave up at that point and Kuryakn gave me credit on my purchase. I didn't want to risk another one breaking. I used a 3/4 helmet in mine and I don't think that pin locking mechanism is stout enough to handle that weight.
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It a locking mechanism that mounts onto the end of the grip. I like it because it's kind of stealthy and I couldn't find a place on the bike I wanted to mount a helmet lock.
www.kuryakyn.com/category.asp?bn=metric&cn=Grips&page=2