I fabricated an aluminum bracket so that the handle attached to the window. The bracket screws into the window frame. If I recall correctly, I cut the aluminum to shape with a hacksaw and filed off the rough edges. Then I used a propane torch to warm the metal so it would bend without crystallizing and breaking.
Once I had fashioned it into the required shape, I drilled holes for the screws with my drill press.
If you can post pictures of what happened to your handle, we might be able to chime in with some suggestions. Good luck!