Replacement part

Looks like you need an all new operator. We may be able to help, but your photo here only shows the arm. While these are important to see, that only tells half the story. Can you also show a clear picture of the base on the inside of the window?

In the meantime, I suspect you might have our 39-188 and 39-187. They might be a good place to start, at elast. Review their specs below to verify.

Dimensions for 39-187