FF,
No "copy" is better. One can make a very good quality copy taking time to do a good job. A "knockoff" is a cheap quick and dirty imitation meant to fool people into thinking it's a good copy of the original.
Here's a "copy" of the only anchor test I know of that was done on a mud bottom. My first XYZ was the one in this test. It was an amazing anchor but I usually could not get it to set in anything but mud. It's in the landfill at Thorne Bay now.
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Eric
North Western Washington State USA
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