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Registered
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,878
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The spark plug end unscrews. So if you are getting a different reading on one do an unscrew and reconnect. Don't worry too much about the details, just as long as all the leads ohm readings are much the same. On my 20 year old set I snipped 10mm off the ends and reconnected the plastic, spark plug end, and they are perfect.
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