pella center opening casement window mechanism

Thanks for reaching out! The part you are showing appears to be the bracket connected to the Pella Sash Crank Operator, which is not sold separate from the operator unfortunately. Therefore, you'll need to replace the entire crank mechanism.

Take a look at part 39-176 (its opposite handed version is part 39-175). Carefully review and compare the dimensions to your existing crank operator to determine if this is the replacement you'll need.

The compatible crank handle is part 39-109B.

Dimensions for 39-176

Alternate view with measurements