I was wondering if someone with a glow plug reamer could measure the exact diameter of the reaming portion of the tool. I figure its got to be a little bigger than the end of a GP. I'd like to just use a drill bit to ream out my holes when I relplace my plugs and bypass the expensive "unitasker". I've done some searching on the forum but I haven't found any exact sizes. Could you also include the car that your GP reamer is suited for. Thanks

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'85 300td Frybrid WVO Kit