Spark plugs with 3/16 x 40 thread.

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I just purchased a 5/8" -12tpi LH nut from an eBay supplier. China was on the package. It was for a Delta Unisaw. It only went 1/3 of the way on. Nothing could be done as there is no way to retain the arbor while threading. The next attempt was from Amazon, and it fit perfectly. It was also sourced from China.
I returned the junk one. It's the only way the seller will learn. He did offer me a 25% discount, LOL. I only mention this because it seems to be the same issue, only in a much larger size.
 

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