My yard has a chain-link fence with a metal top rail. In a couple of places a tree grew through/over/around the fence. Both branches are 8-10 inches diameter. In one case I killed the tree and cut the trunk off just above the fence. In the other case it was a tree branch; the branch was cut off above the fence, but is still attached to the main trunk.. I want to remove the wood that is in the fence. Is there any way to make the wood rot so it could be removed without damaging the fence? I don't want to harm the living tree. The part that is in the fence could be cut free from the trunk with a chainsaw. Is there anything that would cause the wood to become soft enough to chip off easily, say with a hand axe? I read about the various stump remover chemicals, but no user reports. Instructions seem to recommend keeping the stump moist. Since the wood is above ground, it can't be kept moist. Any ideas? The wood is not too hard (Manitoba Maple, or Box Elder) but I don't relish the idea of sitting there with a hammer and chisel for weeks/months.