K & K window parts needed
When those worm gears strip out, the only solution is to get a new operator. We can help, but I need to see the rest of the mechanism. If you can remove the original or at least open the window so that I can see the whole thing in one shot, I will be able to match it up to a replacement in our catalog.
This is a big help, thank you! Looking at this new photo, I recommend our 39-031 casement window operator. You should carefully review the dimensions we show on its store page just to be 100% sure that they match up, but I think they will. Also see the 39-032 for the opposite side.
You can probably reuse your old cover and handle, but just in case, you can also see our 39-107 and 39-114L.