
So after receiving my Porsche 924S I set about "zeroing" the car. Spark plugs, fluids, etc. My third cylinder refused to tighten a new spark plug and I was reluctant to force the issue. I have this thread cutter, 14mm x 1.25, and after filling the grooves with anti-seize I screwed it in and pulled it out of the head. gold mine. This kid removed a bunch of old oxidized aluminum and carbon and my new NGKs screwed in perfectly. Great tool, I recommend 10000%. Hats off, Lyle.

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