Replace part of arm assembly to open

Hello,

Thanks for writing in! I believe you may be referring to the casement window hinge. I'm happy to provide you with a replacement recommendation but I'll need to know the length of the track installed to the window sill to narrow down the best replacement options.

Please don't hesitate to reach out with any questions.

I believe the 36-004-18 should be the correct replacement. To confirm, carefully double check the dimensions below. Keep in mind, you'll need to replace both the top and bottom hinges at the same time. This set can be used for both left and right handed applications.

Dimensions for 36-004-18