Patent ID: 8745844

Claim:
A method of attaching a head assembly having an annular hollow boss to an arm having a through hole of a carriage, the head assembly including a load beam of a head suspension and a base plate fixed to a base part of the load beam, the boss formed on the base plate to be fitted to the through hole with use of a caulking ball, the method comprising steps of: inserting the boss into the through hole, thereby setting the head assembly to the arm of the carriage; setting the caulking ball on the boss; bringing a cylindrical jig into contact with the caulking ball set on the boss such that an end of the cylindrical jig is set on the caulking ball; supplying lubricant along the cylindrical jig to the caulking ball set on the boss so that the lubricant is fed from the end of the cylindrical jig directly to an outer periphery of the caulking ball; and pushing the caulking ball with the cylindrical jig to pass the caulking ball through an inside of the boss and diametrally expand and plastically deform the boss, thereby fixedly fitting the boss of the head assembly to the through hole of the arm of the carriage.