Old Casement Window Operator

Thanks for posting. I am afraid I can't cross-reference that code to anything, and there's a few different operators with a 'zigzam' arm. Can you send us photos of your old mechanism? A bird's eye view, with the window open so we can see both the gear body and the arms, would be best. We'll do our best to help you from there.

Thanks, that's perfect. This looks like the 39-090 Operator to me. It has that Z-shaped arm. Just make sure the dimensions match what we show below. For a new handle and stud bracket, see the 39-114L and 39-508 sold separately.

Dimensions for 39-090