Here is my implementation of the Kleinbauer lead screw bearing support. It's just a fender washer with appropriate cutouts for the leadscrew and retainer screws (4-40x1).
http://members.aol.com/ke6njc/myhomepage/xtbrnga.jpg
In the background there is a handwheel I made to drive the axes while I'm building.
robotic regards,
Tom