I have a 1965 SWB Porsche 911 project (2.0L flat 6). One of the many things that Porsche could have made easier, but didn't, is spark plug removal and replacement. I bought 3 deep sockets from other sellers, all advertised to work on this engine . . . nope!
I believe the Sierra Madre is a copy of the original spark plug "wrench" that came in the original toolbag. it is a 6 sided wrench with a deep socket on a shaft, with a machined hole at the end of the shaft for an allen wrench. The socket part has a rubber ring/sleeve to slide over the insulator for a friction fit to remove the spark plug from its recess. I found that leaving the rubber ring in the socket made removal difficult. It is unlikely that you can fit the socket over the spark plug in the exact position it needs to be to line up with the 6 sides of the spark plug nut, since you can't see what you're doing. I removed the rubber ring with a pick, and used just the socket and allen wrench to unscrew all of the spark plugs. piece of cake. Then I put the rubber ring back in the socket and slipped it over the insulator and pulled out the unscrewed spark plugs. To install new plugs, I just left the rubber ring installed and squeezed on the new plugs. When you do this, you have to make sure the plug's hex nut is lined up exactly in the socket. Then you have too push hard to get the plug's nut into the socket. The rubber ring may actually be a bit too thick or too dense to be of optimal help, but works. I'm glad I got this tool and recommend it to everyone.
