1. Whether I tighten the lock nut or not, the firewall adjuster simply will not move. I've left it loose with no movement whatsoever. That Mustang Warehouse Firewall adjuster looks just fine to me...hell of a lot cheaper than the others, and jeez, it's just a friggin firewall adjuster...just a big hollow bolt!
2. The difference between the 2 pickup and quick release, steep ramp steeda quads is so minimal it's a crime that they sell these two things as two different pieces. I've got both, held them both, back to back, and I can honestly tell you the difference is minute. I swapped back and forth and there is no difference in release points.
To adjust the release point, well, it's a combo of things. I found the best way is to be able to adjust the cable completely - at the trannie, at the firewall - and then added the maximum motorsport clutch pedal adjuster-then fine tuned it all and now the pedal sits even with the brake and the release point is about in the middle of the shorten travel. It takes some time and patience to get it right, especially after adding an aftermarket clutch.