If anyone has a broken pair of Fritschi bindings lying around (virtually any model, I believe), I will buy the DIN spring from you. It's easy to remove.
You want the release spring for the toe/lateral or the heel/forward?
I have a D3 rail with a broken toe mounting plate -- the rail still has the lateral 3-10 release spring inside, and attached to the rail is a broken heel unit with the 3-10 release spring inside.
I also have a detached but perfectly functional (I think...) D3 heel (with its 3-10 release spring inside) and an original-generation (gray & yellow) DFR heel (max 12 spring inside).
I'm interested in the toe/lateral release spring. You access it by removing the toe piece and then unscrewing a torx screw that is located underneath the binding. Once that screw is out, it's easy to remove the entire spring mechanism. I need the entire mechanism (I can send photos if necessary).
How much do you want for that part?