The valve adjustment tips on this site are wrong.
If you follow the Step A/Step B scenario as written, you will be setting some tappets that are NOT on the base circle of the cam.
Note the duplications between step A and Step B; if one step is correct for a given tappet, the other cannot be, and vice versa.
Make sure you can rotate the tappet you are going to be adjusting, by hand, before you start.
That way, you will be certain that the tappet is on the base circle on the heel of the cam, and not on either ramp.