It says on wikipedia that the device contains a cartridge with electrodes and propellant for one use,the cartridge is replaced after each use. http://en.wikipedia.org/wiki/Taser
take 1 flashgun
remove light tube
replace with two darning needles or bodkins
(you can use a short length of brush handle and some thick wire)
hey presto! - agony on a stick
alternatively ... those electric fly swatters will give a decent nip!