Interior gears/ window crank handle/ arms to window frame

This window was installed 15 years ago. I cannot find a brand. I cannot find any numbers. The problem is that the window will crank open but will not crank shut, so there is a flaw in that little "gear box" inside the window frame. are these pictures good enough? I assume that maybe the crank part and the arms to the window need to be purchased together. Len