Simple K'nex Safe Mods By code_dawg12 in LivingLEGO & K'NEX1,05012Introduction: Simple K'nex Safe ModsBy code_dawg12Follow More by the author: About: I love to build things and currently want to build a hovercraft but I am having trouble More About code_dawg12 » I used slitheins simple knex safe and modified it a little an turned it into a combination lock