Hi guys, İ am planning to check my valves in a few days. According to Honda's repair manual İ must have a stopper tool (page 99), and remove the cylinder head cover and turn the cam chain tensioner lifter shaft fully and must secure it with this tool. İt is a simple key like piece of metal which İ already build. But in haynes manual and on youtube no one ever use this tool. Did someone used this tool? Is it an obligation? If so what is the mission of this tool? Thanx.