Caradco Awning window crank
Thanks for writing in. We can help you replace this operator, but we're going to need to see the link arm(s) as well. Seeing a bird's eye view of the whole operator including those arms, either out of the window or at least with the window open, would be a big help. For removal and replacement details of an awning operator, see the video below.
The arms cannot be removed or replaced, I'm afraid. They're built into the base of the operator and count as one unit. If you need a new base, you'll be getting new arms, too.
That said, I think yours is similar to our 39-083, or maybe our 39-140 depending on size. Look over each part and see which one is a better match.