i also broke my stopper. i have no idea how, but now it pops out everytime the skis fall off.
i tryed to repair it, but it just fucked upp again.
you need to buy a new stopper, you can try to repair it but don,t have to big exspectation.
your ski isnt the onely one, my marker binding got fucked up too. the stoper is all fucked up, and a plastic part is gone. i hate my marker bindings. this is the last time i use marker bindings.