Window doesn't stay up

Question

This is the part on another window of mine that is broken. The broken window no longer stays up by itself.

Tom · Accepted Answer

This part is called a pivot bar. It's very difficult to identify these while they're still installed. Based on what I can see of the design it may be a match for the 26-357, but you need to remove the original to verify.

Alternate image for 26-357