Well I picked up a Delta 43-120 shaper yesterday in dire need of a new home. I have a couple questions though about stacking cutter heads. It came with a set of stile and rail cutters that are stacking. One blade does the round/ogee, another does the groove, and the third does the back. Do these have to be lined up on the spindle on top of each other so it works as one cutte,or or can they be off set?