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its a new thread which is drilled into the head like a sleave then u can screw the new plug in, had to do it on my 172. i got it cheap but will cost like 100-120
gutted. u have blown a plug out, the head needs helicoiling, bout 100 notes. and lets pray that the rest of the plug and the old thread isnt sat on a valve seat. that will be messy
what ever u do dont let any one tell u it possible to do your self, done mine over 5 days took 100 man hours
try black diamond in warrington. the quoted me 300 all in