The gasket is a great idea for removing an old spark plug, it's a very tight fit. However, when installing new spark plugs, the spark plug is so tight that it is impossible to remove the socket from the spark plug without disconnecting it from the extension cord used. You may need to pry the socket out of the spark plug well with pliers as it is stuck to the new spark plug you just installed. Perhaps a magnet would be a better design choice.
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