Hello,
We'd be happy to help but it looks like the spline that attaches to the handle to the base of the operator is broken. Unforutnately, that means that the entire assembly will need to be replaced since the spline can new be repaired once it is broken. If you could show us your operator with the window open so that the arms that move the sash are fully visible, we can go from there. Thank you!
Thanks for getting back to us. We carry a handful of similar operators with a rear-mounted base, which we've related on this page for you to review. A key factor would be the length of the arm that moves the sash. Take a look and see which option matches your specifications.
