An employee and a coworker were completing a roll change at the caster runout. They had already removed the old roll and were putting the new roll into final position. The roll was supported by an overhead crane. The coworker on the west end of the roll was providing hand signals to the crane operator in the cab. The injured employee was on the east end of the roll trying to guide the bolts into the bolt holes. The injured employee's finger was caught between the flange of the bearing housing and a piece of key stock welded to the structure, resulting in a right index finger amputation at the first knuckle.