Works well, it's hard work, you really have to be careful not to have any problems. a tool intended to be used every few years or so, if at all, and it won't sell as easily as I've tried to. The build quality is really good and the tolerances are tight, the job was done well and my spark plugs are tight now. I bought the oil and Loctite they recommend for the job just in case. Also some dielectric grease in the threads of the connectors to prevent them from snapping for later removal. The box is not the best quality.
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