Double hung tilt window

Thanks for posting. I'd like a little more information to confirm what you're working with. Can you show me where on the window this part installs? You also say it holds the arm in place, but I am afraid I'm not sure what arm you're referring to for a hung window. If you could show me the mechanism in question that would help a ton. 

Thank you! That's a huge help. I recognize what you need now. I believe you're looking for the 15-056 pivot retainer. This is commonly used with the 15-105 pivot shoe, which appears to be exactly what you have installed already.

Give the 15-056 a look and let me know if you had any questions!

Alternate image for 15-056

Great! Glad to hear it's a match. I can't place an order for you here, but you may do so directly on our site at your convenience.

Please let me know if you had any other questions and I'd be happy to advise.