NWSL Stanton drive : corrected drawing
Download pdf diagram
The most important change in the diagram is that the real centerpin has moved 0.87 mm to the (front) A end of the bogie. I consider as A ends those where the wires came out and where the removable coupler support is mounted (who is not shown in my diagram)
So you must deal with a "real" and a "virtual" centerpin with this motor bogie. The Stanton drive with 6'6" wheelbase would be symetrical.