Window handle

Thanks for posting. When the crank handle breaks like this, it's best to just replace the whole handle. We likely can help, but I'd like to see the entire operator, including the arm(s) that come out of the back of that gear box and push and pull the window. A bird's eye view of everything, with the window open, should suffice. When we identify the operator you have, we should be able to tell you what crank handle you can use.