Assassins Creed Inspired Retractable Blade

its been a while since i have posted and i thought i would get back into knex. after looking around for a half decent retractable blade all i found was that the "blade" was only 1 rod. after a bit of brainstorming i came up with mine. its not great, it has a terrible release and no lock so if u stab someone with it it will retract, but it has the shape of a blade, and if there is some interest in it i will develop it further and put up instructions. so without further adue here it is...... dont be too harsh and as i said if ur interested in it rate and make sujestions if you can think of any :D