Michael The Mentor came up with a fairly ingenious idea for pulling focus using only three simple arrow post-it notes. Attach a post-it to the center of your lens. Find the two fields you are planning to focus on. Then place a post-it where your lens ends up for both fields. When you’re shooting all you will need to do is line up the post-its and you’ll have the perfect rack focus.
Thanks to DIY Photography for the heads up.