Anyone done this? I've heard about the procedure being done but never actually done it myself. I got a brand new one today for my rebuilt 400 which is waiting to go in my K30. While installing the mod, I noticed the slot in the vacuum plug port and immediately had to ask what others have done to adjust it. How many adjustments are there? Where is the best performance at? Turn it all the way left or right and work my way left or right? Any info or tips highly appreciated.