subject to wear and abraiion through vibration ot tke steel holding screw or i ted a or friction caused by Itt removal and ... 340, ^ INSERT* ssssra But a who* a ttainlets steel Heir-Coil Insert Is Installed a the entire wearing action of the screw or stud Is on the hard metal insert rather than on the cast or base material. ... parts in manufacture, and for repair of damaged threads. ... Kansos City 6. Mo. LOS ANGEIES ). S. Wise Room 925, Pacific Mutual Bldg 523 West 6th St. los Angeles, Cal.