Where the rod go's from the plate to the top is adjustable. Pull the leaver down and adjust right or left or up and down and you can tell by the pressure on the primer plate when it feels less drag.<The direction the rod moves puts pressure on the powder bar>
With the handle up loosen the two screws on the bottom of the powder bar. When the power bar centers and you can see the primer tighten the screws. <had to edit because of a phone call when typing >