forming a first beam having a first end defining a pivot, and a second end having an axle-receiving opening therethrough defined by a surface, at least a portion of the surface being generally cylindrical and defining a first diameter when the beam is at a first temperature;

providing an axle defining an axis having a generally cylindrical outer surface portion defining a second diameter when the axle is at the first temperature, wherein the second diameter is less than or about the same size than the first diameter;

providing a temperature differential between the first beam and the axle such that the first diameter is about equal to or greater than the second diameter;

inserting the axle into the axle-receiving opening while providing the temperature differential; and

removing the temperature differential between the first beam and the axle to provide a tight interference fit between the first beam and the axle; and

forming a second beam having a second axle-receiving opening therethrough defined by a second surface, at least a portion of the surface being generally cylindrical defining a third diameter when the beam is at the first temperature;

providing a temperature differential between the beam and the axle such that the third diameter is substantially equal to or greater than the second diameter;

inserting the axle into the second axle-receiving opening; and

removing the temperature differential between the beam and the axle to provide a tight interference fit between the second beam and the axle.