Use a tree saw to cut the trunk of a sturdy piece of branched wood so that it forms a flat surface.
On a 1 1/2-inch-thick piece of wood that is wide enough to provide a stable base (this one is about 15 inches across), draw intersecting lines. On the base, mark trunk's footprint at approximate center. Mark placement of four 3-inch wood screws.
Drill pieces together.
Remove bark from the base if desired.
Trunk of branched wood
1 1/2-inch-thick piece of wood
Four 3-inch wood screws
This scratching post was made from a fallen tree on Martha's property. It's 18 inches tall, but you can make yours any size.