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Place a heavy grease and Vaseline soaked rag through injector hole. Over drill and tap it out and use thread replacement. Vacuum out the area. Pull the oil soaked clothe slowly. Blast high pressure air. Look with boroscope and if fragments remain, blastout with oil or soapy water until clear.

Air compressor will also help blow out stubborn pieces. Direct flow of air into glow plug hole and catch broken pieces with gauze or wire basket over injector hole.

Swollen glow plug. Removal tool broke off tip. Removed fuel injector. Extracted tip with magnet (also can use compressed air, flexible grasper, etc… Pics will be self explanatory. Posted with Hummer H1’s permission.