Man, this thread is like watching this skit:
https://youtu.be/kTcRRaXV-fg
Just to clarify as I also didn't really get how Dimension worked until recently, and I see why you might be taking the replies the wrong way (just seems like miscommunication on both sides that someone needs to clear up and we can all get along).
What Rogueblader is trying to say is that the tip mode change happens by itself as part of adjusting the height - while you screw it to adjust the height, at various points in the rotation used to adjust the height, the tip pokes in or retracts, if that makes sense?
Maybe that also explains why it's hard for people to answer without sounding like they're just repeating themselves because what they're saying is accurate - you don't actually do anything additional to change that mode.
Rogueblader, thanks for providing a factual answer to the question, I hope this also explains why MrMister might have taken it the wrong way. Can we all agree to get along?