K'nex Grenade No.3 By BluePianta in LivingLEGO & K'NEX112Save PDFFavoriteIntroduction: K'nex Grenade No.3By BluePiantaFollowMore by the author: You can use big K'nex too if you want Step 1: This part is somewhat tricky. You have to click these pieces together all the way, or it is wrong and will fall apart Step 2: Step 3: Step 4: Step 4 (Optional)