I purchased a used snowcaster that is complete but in parts. I tore it all down, sandblasted it and painted it. I am in the process of putting it back together but have a question with the chute control (to make the chute turn). I have the screw part that has a straight pin running through it. I pulled the pin out and put the screw between the 2 brackets on the snowcaster frame and put back in the pin. However when i attach the handle to it and turn it the pin through the screw just spins as well and doesnt turn the chute? am i missing a piece? What prevents the pin in the screw from just spinning in place?