Replacing the Battery in a Musical Watch?

I change the battery myself on my watches (I have a large collection). The only problem I have is the musical watches. I can change the battery for the music portion of the watch but I still can't get any music to play. The watch portion (time keeping) will be fine. The music portion is a piece that you have to remove completely if you want to change the battery for the time keeping portion of the watch.

It looks like I put that piece in the same way as it was originally but I don't know if I have to "do" something special to get the music portion of the watch to work once its been removed and put back. Can anyone help me with this?

Mary from Bakersfield, CA