I've had the same issue with using the installer tool on small block Fords. My solution: spacers. Screw the nut back almost to the outer end of the tool and install some kind of spacer between the bearing and balancer itself. This will place the large nut on the tool out toward the end farther so you can use a wrench on it. I use two large nuts stacked on top of each other for spacers but even a short piece of pipe would work. I don't like using the crank bolt to pull them on, I stripped the threads doing that once.