Huh, that's a very interesting design, never seen that... I'm guessing there are detents to keep it from springing back?
No - If these are anything like the E36 M3 stock mirrors, these are non-folding. The only reason the springy action exists is so that the rmirror doesn't rip off in case someone taps the mirrors.
BP 2005 330i ZHP / 6MT Imolarot / Naturbraun 2003 330iT / 6MT
Orientblau / Naturbraun
It's not the car you drive, it's how you drive it.