Nasty pix of transom, didn't clean up transom for it's photo op, and used camera in phone, but here is mount location:
You can see some of the 5200 where other locations were tested, as well as blue area where old original flasher transducer was located.
http://www.wellcraftv20.com/gallery/...ducerLocation2
EDIT:
Cleaned up transom with new transducer location:
http://www.wellcraftv20.com/gallery/...&id=after2