Broken handle

Thanks for your post. The handle is built into the operator so you'll need to replace the entire mechanism to complete the repair. This window operator reminds me of the 39-070 Lever Lock Awning Window Operator. It is attached to the window using the 39-170 Window Sash Bracket.

To determine if this is the correct replacement match, carefully look over the specifications and compare them.

Dimensions for 39-070