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Well it is supposed to be a 14mm x 2.0 pitch and as all taps and threads have a percentage of engagement that can vary from 70 to 85 if you put the insert up to the tap you can see maybe 25/30%, its ugly. I bought a bunch of them from the same source as you and I was not able to install the insert in the tapped hole without a considerable force so I bought some from Ollies which probably sourced them from Canyon the company that makes all the Head Studs for Porsche and VW and they went right in like you would expect.
regards
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