Quote:
Originally Posted by funola
Edit: By cleaning the hole well with brake clean and blow dry with compressed air and looking with a mirror, you may be able to see the different material of the aluminum head and glow plug body and thus where you have drilled. Take some pics also.
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In one of the photos it is very clear that the remaining glow plug shaft (how much of it's length, we can't absolutely know) is visible. It is clear where the steel of the GP is in relation to the surrounding aluminum of the head.