As a tree ages, it develops hard temperate wood branches. While these branches are excellent for supporting the tree's growth, they can make grafting more difficult. The type of grafting used for fruit trees with temperate hardwoods is known as topworking. Topworking is the practice of removing old growth and attaching new growth from another source onto the stumps.
Remove all branches from the limbs of the tree being topworked and cut back the limbs to two feet from the main trunk.
Slice the bottom of the scion wood so that it has a two-inch pie-shaped point.
Cut a double door shape into the bark of the tree at the end of the limb roughly two inches high and two to three inches wide. The cut should be made with a razor sharp grafting knife and be down to the wood.
Use the tip of the knife to gently peel back the bark on both sides and place the scion inside.
Close the bark and place a nail on both flaps to hold them down.
Cover the entire graft site in two coats of grafting wax to lock in moisture and keep out diseases.