Holes for fit bolts and fit pins may be either drilled full size or reamed in situ. If the holes are to be reamed in situ, they shall be made at least 3 mm undersized initially by drilling or punching. If the fastener is to fit through multiple plies, they shall be held firmly together during drilling or reaming. The reaming shall be carried out with a fixed spindle device. Acidic lubricant shall not be used.