I'm setting the overhead on an 855 with STC Step Timing Control. I've set lots of top stop injectors but am having trouble grasping this stc concept. Cummins list's a tool that goes into the secondary plunger of the injector. Is that tool used to pry up the secondary plunger through the little holes in the side? Then set the injector like a top stop to 6" lbs? By the description that is what it looks like but I don't want to assume and make a mistake. Thanks