When I contacted Stern about my Demon Lock malfunction. The balls would lock in the head but could not eject properly at certain times. They said it was a mechanical issue and sent me this part. I will install this today and report. It appears this new piece has a different angle to launch the ball. If I look under the head as the ball search is in progress the ball is ejected straight up and falls back into the hole instead of launching forward. I am hoping this helps as I am not looking forward to removing the head.