Dean's walkie talkie has a screw in it. When you run it up the limb you watch the gap between the screw and the bow limb then go back and scrape where the gap closes. With this tool it marks exactly where you need to remove wood, you don't even have to look at the gap when you run it up the limb, very quick and precise. Dean has a pencil marking tillering tool on his website but it is more complicated to make than this one and not as easily adjustable. I sent Dean a link to the the tutorial on this tool and he thanked me