Personal Defense: How to make a stun gun with a disposable camera. This is the guide to make a device which runs on a battery and produces sparks at tens of thousands of volts very rapidly. No doubt illegal in Victoria and many other ‘nanny state’ places, but very useful anyway.
http://preppingfortheworst.blogspot.com/2012/10/personal-defense-how-to-make-stun-gun.html
See Also:
http://survival-mastery.com/skills/defence/homemade-self-defense-weapons.html
https://www.skilledsurvival.com/homemade-survival-weapons/
http://www.returnofkings.com/97318/14-self-defense-tools-to-use-where-weapons-are-banned
https://www.lifehacker.com.au/2015/07/basic-self-defence-moves-everyone-should-know/