A ball bearing slide (mine was 25 cm / 10 inch) A hack saw or other tool to cut metal A nut and a bolt Dril bits (one that's 1 or 2 mm for the spring holes, and one to cut a hole for a nut and a bolt. The size of the drill depends on the size of the bolt you are using) Rivet + rivetgun 2 springs (a long one, and a short one) Solid copper wire (I used it to make the weird 'unlock' mechanism shape) A ring (a keyring is the best solution) A string Soldering iron + soldering equipment itt van. :D CSak Fordisd le! :D