Instructions: If needed, use soapy water to find the leak. Remove the object that caused the puncture. Insert the serrated tool into the hole and slide it up and down to toughen and clean inside of the hole (A) Coat the needle with rubber cement and slide it up and down in the hole until it is thoroughly coated (B). Insert the plug material halfway into the eye of needle. Coat the plug material with rubber cement (C). Insert the needle and plug material into the hole until it is about two thirds of the way in (D) Rapidly pull the needle straight out leaving the plug in place. Do not twist the needle when pulling out(E). Cut off excess plug material flush with the tire. Check for more leaks with soapy water(F).