I used this tool when trying to change spark plugs. The problem is that as soon as you tighten the spark plugs and remove the extension wrench, the extension comes out of the spark plug socket. I had to use another tool while trying to pry the spark plug socket out of the spark plug. I did some tests to conclude that the problem is not with the extension but with the spark plug socket, the actuator is poorly made to hold the key or extension.
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