I don't know if this thread is still active, but I have the identical shower door handle with latch mechanism and a similar problem - the spring-loaded ball in the door handle doesn't extend far enough to engage with the shower frame. Further, I don't seem to have the "notch" in the frame alluded to by the home owner from Atlanta; I am curious about this "missing" second piece in my shower. My home was built (and the shower installed) in 1984. The shower door handle I have includes a sticker that says "Corinthian Gold by Howmet." I am looking for replacements for this specific door latching mechanism.