The exercise I described earlier was two-fold. 1) To help identify the FPB. 2) To get you to feel and realize that as soon as the tab on the trigger bar touches the ramp on the FPB and starts to compress the FPB, you'll feel an increase in the trigger pull.I'll flip it over and check it out later tonight. But I think I have the mechanism already figured out and where the spring goes. Yup. I'm using the S' springs that you 2 gents figured out.