Jim,
I did basically the same thing except I added one more part. I have an "adjuster nut" on the trailing ballnut and use a sockethead screw through the adjuster nut into the rectangular socket. My wave washers are captured between the rectangular socket and the lead nut. Then the trailing ballnut is run up to the whole sandwich (just snug and lined up), the adjuster nut is then tightend to the proper spec and "pinned" by running a socket head screw through the adjuster nut into the rectangular nut and then a setscrew is tightened into the trailing nut so it won't back out. A picture can be seen on my web site noted below.
Bubba
Art
AKA Country Bubba (Older Than Dirt)