My wife's 2007 4cylinder two wheel drive escape has always made terrible be lt noises. A new belt will fix it for awhile, but it always comes back. I would like to check and make sure all the pulleys are perfectly aligned with each other and thought about making a laser tool using an air pistol laser scope. I would like to mount it to a piece of channel iron that would fit into the grooved in the pulley. Does anyone know what the spacing is betwee n the grooves so as to know what size channel iron I need? Because it is he r daily driver, my access to it is very limited.