grind a special socket
take an 18mm deep socket and grind a large radius on the top edge from the square of the 3/8 hole on down, round off that whole top edge This allows the socket to make thedown into the head easier with the valve covers still on. A wobble socket extension also helps get in there (Snap on makes them, they are awsome!)
a rubber insert placed in the socket like is in a normal spark plug socket will hold the plug on the way in and out.
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