I'm rebuilding my Raleigh road bike to keep in California, and I've installed Nashbar "Jail Brake" dual-pivot road caliper brakes.
The brakes seem to work fine, but when tightening the bolt down on the brake cable, I notice there's a lot of play between the caliper arm and the quick-release mechanism that holds the clamping bolt.
I've taken a couple of photos to show the range of play. I disconnected the cable tension for the shot, as any tension will obviously pull the clamping bolt into the "up" position (the crisper of the two photos). I cropped the photos so that they're basically the same angle, but it's not perfect. Nevertheless, you can easily see the difference between the clamping bolt being "up" and "down".
The actual range of play is greater than what is pictured; those are just the spots that would "hold" by themselves when I pushed the bolt into position.
I'm just wondering if this points to any problem down-the-road. I doubt that it does, but it may and wanted to get people's reaction. There appears to be no way to adjust the quick-release mechanism or tighten it.
Here's Nashbar's picture of the brake itself (linked to a larger photo):
and here's my animated-gif picture of the clamping bolt's play: