Received a helpful PM-
"Great find Josh on the change over rod. From what it looks like. The rod can move well over .100" within the tube. It looks like the openings are off by .100" and there is still additional room for the rod to move further. I was thinking about making a spacer real quickly on the lathe to see how it will fit inside there. I am going to try to make it out of delrin..."
I'm glad to see others interested in this.
I'm about to head downstairs after I eat and see if I can make some progress. I'll take some pics while I'm at it.