The piezo rod sits down inside a slot in the bridge base [ no glue ] the the bone saddle sets on top of the rod [ no glue ] the strings go over the bone saddle...the pressure from the strings pushing down on the saddle is what makes the sound. Running the strings directly on the rod piezo will eventually ruin the rod piezo, it is very fragile under the dipped coating. I set up my rod wire to be soldered on, but you can buy a special 1/8" - 1/4" tailend input that the rod wire will plug into inside the box.
Thanks thats alot of help,don't suppose u got a close up pic of the saddle n pezio?I know I'm prob bugging u to death,sorry.
Here`s the bottom of a prototype bridge i did, you can see the rod in the slot. This bridge had the saddle glued to the top with the rod sticking out the bottom just a hair, then i attached a very thin piece of deer skin to the bottom of the bridge base. The pressure of the whole bridge pushing against the lid worked pretty good, but i still prefer the standard design that i use now.