First off, Do not do this without a gauge. This is not a science and every truck will be a little different. I'm sorry about my directions, let me see if I can clear this up. The modified screw is twisted into the end of the spring and is inserted into the brass plunger. This way you can twist it out to fine tune the pressure. Some people use #4 stanless washers and I'm not to shure about why because the fuel lines are steel and break down inside anyway. Hey, I'm with you. I have to get the motion picture in my head before pick up the tool's. This is worth doing and so is the cross over line between the hp oil galley's in the heads. There are links with pictures on most all mod's for the powerstroke. If you use the sites search you most likely will find what you need.