re: Replacing rotten posts in overgrown fence line

I have had excellent success in the past extracting the stumps of rotted off fence posts by using an old three quarter inch bridge timber lag bolt approximately 12 or 14 inches long. Using a couple of feet of chain, I sllipped a heavy washer and an enlarged chain link over the bolt, then with an electric impact wrench, I screwed the lag bolt down into the center of the stump of the post. The stumps always seem to pull easy fairly regularly since the rot was primarily around the outside and not at the center of the posts.

Here is a possible source for them up to 18 & 20" long. Mine came from an old county bridge that was replaced. LINK