Lee's first pic is the rear of the cable, which is where I was able to remove the slack. Turns out the rear end of the cable goes through a hollow bolt and through a clevis kind of arrangement. There is a small lead ball on the end, but that seems to be there soley to keep the strands from fraying. There is also a small sleeve with a set screw near the end. This is where the main adjustment takes place. Slide the sleeve up to the bolt and tighten the set screw. Once it's snug the hollow bolt can be used to tighten it to the desired degree.
Attached is a copy of Lee's image cropped to the clevis like assembly in question . Cable comes in from the left edge, through the hollow bolt, clevis thing, lock nut, sleeve with set screw ending with lead ball on end.
MH