818169 Mercruiser SLEEVE REMOVAL TOOL

Universal 818169 10-24 Nylon Insulated Locknut Zinc, 5/16" x 18" (Pack of 100)
Nylon insert lock nuts Zinc (stainless): Hex nut with a nylon-filled collar at its back end||When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the screw when subjected to vibration||Designed to be used with like material machine screws and bolts||It is able to be reused||Nylon will begin to deteriorate at temperatures from 150-350 degrees F