Silver line casement window won't close

Hello, I have silver line casement windows circa 2006, I believe model 7500. A few won't close all the way without being pushed from outside. I looks like the plastic and metal piece the secures the mechanism to the frame wobbles on the affected windows. What parts do I need to fix this? Thank you.

Thanks, but it looks to me like it is the hinge that is broken , not the operator. That is, the part fastened to the window frame (as seen in the pictures with letter B on metal clip connected to the black plastic piece. That makes the connection from the window to hinge base plate loose and throws off the alignment so it won't latch. What would be the appropriate replacement hinge?