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You can get the double swivel socket right off any Snap-on truck... price is 45 dollars.. I used a standard sparkplug socket with two swivels... I coulnt see the 45 dollars for a one time use... it took me 3 minutes to remove #7 plug with my set up.. and 15 minutes to get it back in.. the restof the plugs took an additional 15 minutes...
I bought the snap on one,, dont waste your money,,,it did help to put the plugs in,, but I found a 1 inch extension and a good regular socket worked on the rear plugs and longer extension on the one to the front....the hose trick helps to start the plugs,,,,
I bought the Snap On for the Vette but have used it for so many other hard spark plug installations it was worth the money. My Pontiac rear plugs have to be done by feel, and the socket helps immensely.