1.   Another reason you may be glancing off the nail heads is that your hammer has a convex face.

2.   Bend the copper until it has a slight concave shape, then slip it under the overlapping shingle, concave side up, until it covers the nail head.

3.   Boards are missing from the wooden play structure, and in some places nail heads are exposed.

4.   Black marks have appeared around the nail heads with streaks going out even farther.

5.   A hammer with a smooth face, however, will often slip off the nail head if the carpenter works too fast.

6.   A Sickens representative thought they were caused by the nail heads.

7.   Chip out decayed wood around the nail head so you can get the hook of the bar under a nail head.

8.   Countersink all nail heads with the nail set and fill the resulting holes with wood putty.

9.   Cover the nail heads with more roofing cement.

10.   Countersink all nail heads and fill the holes with wood filler.