A method for deciding over the compliance of cells at an input of a switch. dolly wheel steering system includes a dolly wheel, a dolly wheel spindle in communication with the dolly wheel such that the dolly wheel and the dolly wheel spindle are fixedly secured to one another and are rotatable as a single unit. The barrier is disposed at least one of the first substrate and the second substrate to control the movement of the spacer. One of the pulleys is driven by an electric motor positioned inside of that pulley.