Need part that holds screen in place

Looks like you need a new knife latch. It's tough to say for sure what you have while it's still installed, but based on the unique bend in the lever I'd say this is a match for our Pella brand 70-216. Look this over and let me know if you agree.

Awesome, thank you! We appreciate it. Please let us know how it works out or if you had any questions.