Yeah, that would have been a really good idea.
Unfortunately I got caught up in doing it and didn’t think to document it. Several threads here discuss this process but I don’t think I saw pics while I was doing my research.
In short, after I removed the shaft I drilled through the existing holes in the lower piece but was only in plastic until I hit the inner shaft. I stopped there and tried to telescope it with a 3lb hammer but it didn’t budge. I hit it with the MAPP torch until plastic stopped oozing out of the holes. (Actually it didn’t ooze so much as it grew like black snake pellets on the 4th of July.) After this it telescoped pretty easily, almost by hand. I drilled completely through the inner shaft at the outer shaft holes and plan to get a wooden dowel to keep it from telescoping any more.