I'm replacing the original Midland booster on my '68 GT with a replacement unit that I got a few years ago and had stored away. I removed the original from the car and compared it to the replacement unit. They're identical except that the replacement doesn't have the actuating rod that connects to the brake pedal. I've tried to remove the rod from the original and it won't come out. I took the old booster completely apart and can't find out what is holding the rod in place. Is there a clip of some kind in there somewhere? How do I get it out?