Need a new plastic part in window...see photo
A quick learner from Oregon says:
September 22, 2014
Hi, so we recently ordered two 27" Series 385 Channel Balances for a window in our home. We installed them correctly (I've done this many times, because we have 50 windows and I take the windows apart to wash the exterior). Anyways, when I went to close the window (right after installing it), we heard a loud pop and the channel balance on the right side had popped the plastic "stop" right in half and also went through the window.
Dave from SWISCO responded:
September 23, 2014
Sorry to hear you're having trouble. This sometimes happens when top sash guides are older. The broken part in your photo kind of looks like our 18-008 top sash guide, though maybe a bit larger. Take a look and compare dimensions with your sample just in case. Is there any way we can see a version of this top sash guide that isn't broken? That may help us find something better. Do you also know the manufacturer?