[68gmsee]

One last fyi: the threaded part of the adjusting screw on my pushrod is app 1 inch long so there's quite a bit of adjustment for a recessed m.c.

Here's how I adjusted mine:

1. I placed a thin metal ruler on the master cylinder and then measured the distance the push rod protrudes out of the booster in a static condition.

2. I measured the depth of the m.c. pushrod hole.

3. Adjusted the adjusting screw out until it protruded about 1/8 inch shorter than the depth of the hole.