Understood. I found out the reason it is difficult to do. On a manual MC the hole in the back of the plunger is about an inch deep. The manual push rod fits deep inside that hole and is held in place securely. The MC for a power booster is very shallow. That makes it easy to fall out with no booster behind it. The push rod you want is like the one that came on my '68 Firebird with manual drum brakes. It is very long, adjustable, and has a clevis at the pedal end to attach to the pedal arm. The clevis is about two inches long and threaded where the rod screws in. There is a lock nut on the rod to secure it. That gives you your adjust-ability. My reason was that when I switched to power disc brakes, even though the braking was much better, I felt the pedal was traveling too far to the floor. I wanted to adjust the pedal higher like I could with the manual brakes. My mistake was using the power disc MC which was much larger but had the shallow hole in the plunger. I needed the disc MC for a non power set up- if that even exists.
