MACHINES FOR INSTALLING BUSHINGS AND SLEEVE INSERTS IN HOLES IN STRUCTURES AND PARTS THEREOF, NAMELY, HYDRAULIC GUNS FOR FOR PULLING MANDRELS, NOSECAP ASSEMBLY ATTACHMENTS FOR SAID GUNS, HYDRAULIC POWER PACKS, MANDRELS, STEPPED DIAMETER HOLE SIZE VERIFIERS, POWER-OPERATED STARTING DRILLS, POWER-OPERATED STARTING REAMERS, AND POWER-OPERATED INSERT REAMERS