DIY Tip of the Day: Post Puller. Here’s a way to pull fence posts without a fancy jack. With an 8-ft. 2x4 as a lever, you can produce about a ton of lift, as long as the fulcrum is close to the rope. Ex-Boy Scouts and sailors will use a timber hitch knot because it’s so easy to undo, but just about any knot will work. A short length of chain also works well instead of rope.