It's baby steps in supercropping. Basically you take the stem with thumb and forefinger with both hands and twist. Be fairly gentle until you get the feel for it. Twist until you feel a snap. Don't worry it shouldn't break. That's the inner Hurd breaking. If you keep doing that all the way up the stem over a few days it'll make a five lane highway for water and nutes. If you continue in the same spot it'll create huge knuckles.