I bought a pair of S385-24 balances, along with a 90-180 sash lock.
The double photo shows the new balance and obviously the clip didn't hold the balance as I raised the window up.
What I did, is as follows:
I removed the window sash as per the instructions on your video. I did not have to remote the old balances since they were already out and somewhat broken. The clips on both sides were flat against the frame.
I proceeded to take out the clips on both sides of the window and installed the balances as per your video. All was fine the balances were held by the clips as shown in your video. I proceeded to install the window sash.
I started at the top and the sash went in ok (but with some wiggling). Proceeded to lower the sash all the way down but the right-side bottom of the balance appeared to be outside the sash channel.
I lifted the sash to see if I could reposition the bottom plastic part of the balance into the channel and when I pushed the sash further up, the right balance went up and out of the sash as the picture shows. When I tried lowering the sash is when the left side clip popped out and lodged on the channel.
I did try taking it out with needle nose pliers but is wedged pretty good and started to deform. I think I may need new clips.
I was able to install the new lock and the window is locked but will not move.
At this point, it appears I need to install a new clip before trying to remove the jammed one, I welcome your suggestions