Replacement crank and cover

Hello, thank you for posting,

There is a chance we can assist with this style of operator. To further review, are you able to show us the window open where we can see a bird's eye view of the operator arms? Thank you! 

Thanks! It's still tough to make the operator out, but based on the design of the arm I think our 39-391 Pella crank might be a match. Just keep in mind that this is only designed to work on Pella windows, and a specific one at that. You have to be sure that your old operator has an identical design as what we show in our photo. If I were you, I would remove the original before you buy anything. You don't want to guess when it comes to Pella.

Dimensions for 39-391