pic: 3 CIM WCD Ball Shifter CAD

[asid61]

On lightening:
I've tried a few different styles and I use something similar to Bryce's method nowadays. However, I start with a huge plate, cut all the holes, and then I draw lines connecting the holes and offset them. Then I cut away all the parts that aren't connecting beams or clearances around the holes. I fillet at the end.
I would love to see your ballshifting shaft. It might be harder to make than you realize if it's in one piece.