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@edscoble
I notice a small problem with those lock (as mentioned already a few post above) - you need a good amount of space inside the alarm lock to make it effective, it won't work if your chainring is very thin like the campagnolo one I have.
http://i256.photobucket.com/albums/hh167/edscoble/Xenaalarmlock2.jpg
See the black rectangle part inside of the alarm lock just under the locking mechanism? you need to cover that part to make it work, because my chainring is far too thin, it only take one to hold it away so the rectangle part doesn't get obstructed by the chainring to prevent the alarm getting sounded, my best solution is (varies on your bike) to lock it on the track end, it's immovable and it's cover the rectangle part perfectly.
http://i256.photobucket.com/albums/hh167/edscoble/Xenaalarmlock.jpg