I found one that a guy made I think with 3d printers or something but seems like an excellent solution.
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I have a carbon frame bike and I don't want to use traditional ulock mount at the top because it creates a stress point by compressing. And the bottom section of this bike is too thick for the holder.

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    I don't have an answer, but that's a great idea. Downsides are that your lock is a lot heavier than a pump and water bottle, So the mount might need more thickness/meat, which means longer bolts. The weight could be more manageable if you were prepared to forgo a water bottle in that position too, to keep the lock on the centerline. – Criggie Apr 27 '16 at 2:21
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    On a steel frame yes, but I have serious doubts with a carbon frame. The stress on the bolts may tear them out since the wall thickness is probably not meant to withstand the weight and the vibration from road-use. – Carel Apr 27 '16 at 7:43
  • @carel - A water bottle mount is intended to hold a 800 ml bottle of water, so 800 grammes and some people mount pumps/inflaters there too. So assume 1 kilogram. But these locks weigh somewhat more than that. Nolawi, how heavy is your lock? – Criggie Apr 27 '16 at 9:53
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    @Criggie: The weight and the CG of the bottle are closer to the frame so there is less leverage. – Carel Apr 27 '16 at 11:08
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    It ways about 2.2 lbs – nolawi Apr 27 '16 at 16:35

This isn't a ulock, but it's the same idea.

enter image description here

It's a 0.9 lb bike lock made from Titanium. They cost $99 and come with a water bottle cage mount as shown.

TiGr® mini Bike Lock enter link description here

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  • FYI This particular lock has been proven to not live up to the promises, it can most certainly be cut easily with boltcutters. – Criggie Jul 17 at 4:22

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