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If you read description under the video on Youtube, then where is the problem or what is unclear?;)Who buys a ground anchor with 10mm shackle diameter, as this example on my Yotube video?This is just a simple demonstration, or how to do it video for beginners;)
"This is not a steel ground anchor, this is obviously just a cardbord/plastic model!"
If you carefully reading what someone writes, the you now(or maybe not) what is my recommendation for front wheel locking to bicycle frame.
"U-Lock with shackle dimeter under 16mm=they are completely useless or junk or not worth mentioning", this eyes wide shut philosophy does not need my the same answer again.;)
The idea is not bad, but the ground anchor would have to be much more substantial that one in the given example. I'd also be worried about the u-lock being bottlejacked close to the ground. Way too much space available for that.
Its a helpful option, but just not fully thought through. I would not recommend it as it is presented.