11.   Countersink the nails and fill the holes with wood filler, sand and finish.

12.   Countersink the shaft and fill with wood filler or a dowel.

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

14.   Countersink the nail heads and fill the holes with wood filler.

15.   Drive the nails at opposing angles so they anchor firmly into the wood, then countersink the heads and fill the holes with wood filler.

16.   Drill pilot holes for the nails, which should be countersunk and the holes filled with wood filler.

17.   Fill the holes with a wood filler of the same color as the wood, then sand and finish.

18.   Fill the holes with wood filler.

19.   Fill small cracks with wood filler that matches or is slightly lighter than the surrounding wood.

20.   If you find pulling the old nails tedious and labor intensive, you could instead countersink them clear through the clapboard and fill the holes with wood filler.