I put a single layer of plastic electrical tape on the U-bolts on my Zumo RAM mounts for my Meanie. That gives it a bit more friction. I've got 2 of those mounts, one for my Zumo, one for a camera.
If for some reason the U-bolt isn't threaded far enough, you could put a washer or two behind the nut. Like Rich said, be careful not to torque the nuts too tight. The cast aluminum is easy to break. I cracked one of my mounts right between the two bolts, but it still works OK.
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