The latest of many brake master cylinders I have installed is the 15/16" version. When I swapped it, I didn't know how to adjust the little sloppy link inside the master cylinder. So, anticipating aggravation, I installed a set of front caliper flex lines in-line with the hard lines that usually connect the master cyl to the rest of the brake system. After a year of having a firm, but low pedal, I finally got around to adjusting the length of the rod. The flex lines made it super easy with no brake bleeding required. I made an intial adjustment of the rod using a tooth pick to estimate the changes I needed to make-that wound up being too short, then I made one adjustment that was too long, then (like the 3 bears) I made an adjustment that was just right. The flex lines made the whole job a breeze.
My only question is: there is no lock nut on the little push rod??