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This is the special tool used to fo valve adjustments on Honda/Acuras. The tool has a socket opening to turn the jam nut and a screwdriver to hold the screw. It is available in numerous sizes. The most popular being 10mm (VTEC), 12mm (non-vtec) and 13mm (volvo/VW).
These tools list for $45.95 and Honda-acura.net guys get a 20% discount so it would cost $36.76 plus UPS