Abstract: A counterbalance includes a first attachment strap, and an arbor rotatably supported by the first attachment strap. A second attachment strap is attached to the arbor, and is rotatable with the arbor about a winding axis. A spiral spring interconnects the first attachment strap and the second attachment strap. A spring support is attached to the second attachment strap. The spring support includes an annular wall that is disposed circumferentially about and concentric with the winding axis. The annular wall is radially positioned relative to the winding axis to contact an outermost coil of spiral spring, to position the spiral spring in a spiral orientation about the winding axis, such that each coil of the spiral spring moves away from the winding axis with a substantially constant angular velocity to provide a substantially equal radial spacing between adjacent coils of the spiral spring.