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repair
Time sert does make a spark plug specific repair kit for 12mm and 14mm and maybe others, they work pretty good as far as installation on 911's assembled.
the tap pilots on the existing thread to begin the oversize cut then it uses the tap to pilot the counterbore tool for the small flange on the insert, we keep them in the race trailer for field repairs and inspect when the engines come down for repair. I have seen some come out with a dry plug but who knows how well they were installed
Good luck, Mike Bruns JBRacing.com
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