What puzzles me is how you could possible clean the brush with a tube of cream sticking to it.
I can be wrong but I would think that #12 is there to block the tube so you can give the bristles a good wash...
True, but I see no lock or catch. It would be a pain in the butt to hold that down and give it a good cleaning. Especially if your gripping the soft tube of cream as a handle.
Also, #12 doesn't seem to clear the tube that much when released...wouldn't getting the cream out be a pain?