I close em completely to start and make sure they sit nicely in the base plate and if they are even all the way around then set the primary w/just a square of t-slot showing and just crack the secondaries 1/4 turn from seated. If they`re uneven then loosen the screws slightly and center em up and go from there. 4150`s don`t always need to to be the same ft and rear on butterfly settings but it takes a bit of time to get em where they need to be based on your cars needs.............
