Spin The Tire and Examine The Tread To Find The Nail (Don't Pull It Out Yet)

Many times this will be easy to spot because you'll see a large screw or nail sticking out, however, if you don't its time to try other ways of finding the leak.

The easiest alternative method would be to spray a bubbly solution (such as window cleaner) on the tire, fill it back up with air, and look for the bubbles that the leaking air makes. That will show you exactly where the leak is.

Physically Remove The Screw or Nail From The Tire

If It is a screw, simply unscrew it with a drill or screwdriver. If it is a nail, try to use a claw hammer, vice grips, of a pair of pliers to get the nail out of the tire. Don't worry if the tire goes flat or makes a hissing sound, that’s just the air coming out (we're going to refill it when we plug it, so it’s not a big deal).

Details Of Usage
Tire is divided into three parts: Tire groove self crown Tire side.
Tire groove location breach repair method: the patch nail screwed into the tire groove below the plane 0.5 mm;
crown location breach repair method: the patch nail screwed into the tire groove level;
Tire side location of the breach repair method: the tire repair nail screwed into, below the tire side plane 0.5 mm;
puncture object oblique repair method: repair with the direction of the breach screwed.

The small size can make up for the gap within 0.1-3mm; the large size can make up for the gap within 3-5mm.