Heres the link to the V1 stun baton:

https://www.instructables.com/id/Combine-stun-baton/

Step 1:

First, as you know, buy a bug zapper and cut off the end with what ever preferred. After that cut two 22 inch long wires and solder them on to the the two wires sticking out of the fly zapper. Then find a pvc pipe thats about two cm thick and some flat mettle to support it. Run the wires through the pvc pipe before you attach the pvc pipe with duct tape.

Step 2: The Head (The Shocky Part)

Next take a bulk maple syrup bottle that you can get at most new seasons markets and poke a hole in the top.then place this over the top of the pvc pipe and run both wires through it. after that its up to you on how you situate the wires. i soldered two more wires onto the ones sticking out the top and ran them down the other side.