Wightsparks
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A bit of an odd one, the head is flat to 0.1mm, (spec is 0.05-0.2mm) been over it with the phone on max magnification which shows even the smallest scratch and no cracks in the head, but all 4 inserts are cracked right through -
I am guessing there is coolant on the other side so there are the leaks
I am guessing there is coolant on the other side so there are the leaks