The top hook wasn't used. The square tubing was just big enough to let the piston hook in diagonally, and the piston fit in ok, but the larger tube of the ram rested against the tubing. I'll post a picture.
I agree that the bottom end seemed to move around a little, but I don't know if its worth the effort to make it more secure. The spring really can't go anywhere with a chain through the middle of it. I'll post a picture of that, too.
"Die Schadenfreude ist die reinste Freude"