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5/8th inch spark plug screw thing size?

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If my NGK C7HSA takes a 5/8 inch socket to remove/install, what size is the screw part? The part that you screw into the head. I need to know the size of the hole of the head on my XR100 so I can get an adapter to fit my compression tester. Is it 5/8th or a different size?

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