mortise lock

Greetings, I had to rebuild my mortise lock after dropping it on the floor. I couldn't find a diagram (or even figure out what brand/model it is). I am down to the last piece. Can someone please tell me where to place the last piece. I can't seem to figure it out. Thanks so much for any help...

Hi, I currently have a rim lock on our back door that needs replacing. I was planning on fitting a mortise lock but obviously the existing holes for the key and spindle will not line up. Is it better to Install another rim lock or do a mortise and fill the existing holes with some dowel and...