Plugs Aren't Just For Hair: You Can Repair Tires

Before you remove the nail or screw from your flat tire, take a piece of tape and put it just below the spot where it went in. With a pen, mark the exact spot that has the nail in it. This will allow you to find the hole again once the object is out of there. It's very hard to find again if you lose the spot.

Don't worry if you forget to mark it, or if your tape comes off. You can use this method to find the hole again.