an apparatus for use in a shrink packaging machine for accommodating a greater height variance of articles includes : rollers , each roller including a shaft and a cylinder on the shaft for rotation about an axis of the shaft ; and a frame including a pair of parallel side members generally extending in a first , horizontal direction and defining slots receiving opposite ends of the shafts for mounting of the rollers there between . each of the slots has a slot length that extends in horizontal and vertical directions , and the rollers each generally extends in a third direction orthogonal both to the horizontal and vertical directions . furthermore , each of the rollers is received within a pair of the slots and is vertically and horizontally displaceable and , when each roller is disposed at its respective lowermost position , the axes of the rollers do not all lie within a horizontal plane .