Jalousie Window Handles
Thanks for posting! I appears the gear that helps to crank the window has been complete stripped from the operator. When this happens, the entire mechanism needs to be replaced.
That said, the placement of the installation holes on your awning window operators remind me of either the 39-011 and 39-012 Superior Window Cranks or the 39-060 and 39-061 Keller Window Cranks.
To determine which of these is these is the best fit for your windows, you'll need to remove one of the existing operators and compare the dimensions. You'll also need to confirm the details of the link arm and how that arm connects to the window.
