[MBEngineering]

HI you have some sort of maual to work from??, it is just that the 19mm nut is (if you have been reading) a bolt, it will "ZAP OFF " with a air gun, as long as the guy befor has NOT locktight the bolt in, you will require tool P9191 to hold the cam to tighten the bolt back up to the correct torque.

regards mike