When setting my roller rocker lash yesterday on, a hot engine, I found I could put a stepped 7-9 feeler right past the 7 and up to the 9 thou step, when I tried to insert an 8-10 thou feeler, it would not go in. I miced the feelers and they are accurate. I am inserting the feelers from the side in the center of the roller. Could the roller be rolling onto the stepped part and giving me a false reading? Is it practice to set rollers so the roller rolls onto the feeler or should I be checking from the front of rear in line with the roller pin?