You can go to this thread on CD, post #14, on our mods for the DeWalt transmission, supplementing Joe Johnsons NBD white paper.
http://www.chiefdelphi.com/forums/sh...threadid=67769
We turn down a 3/4 steel shaft to 3/8, leaving a 1 inch long full diameter, which we thread internally onto the threaded end of the DeWalt tranny. It is pinned with a 1/8 hardened pin, retained with safety wire, to prevent it from loosening. fI have some pics that I can EMail to you, if you want. The mount consists of 4 plates, and one base plate. Plate 1 supports the end of the shaft extension, Plate 2 locks the boss of the DeWalt housing, plate 3 accepts the spacer ring and 4 screws to retain the transmission and adapt the CIM, and plate 4 supports the end of the CIM motor. We remove the anti-backdrive pins, clutch mechanism and adjustment ring, as well as speed shifter springs.