First, to verify punch alignment, place a blank paraffin block in the block holder and put this complex in position on the arrayer as if it were a recipient block. Press the smaller punch down until it leaves a mark in the paraffin surface. Move the turret to switch the larger sampling punch in position, and again make a mark on the paraffin surface. Adjustment is needed if the marks are not coincidental. Punch holes that appear one in front of the other need front to back adjustment; holes to the side of each other require left-to-right alignment.