That little guy above the cam tensioner; a 1/4" drive 10mm socket a 1/4 U-joint connector, as long of a 1/4 extension as you have and a short drive handle will get that little rascal. I have had several leaks from that area on various engines, sneaky little leaks too, the oil wanders around the cam tensioner and often ends up looking like a base gasket leak.. Yes IMHO on any 6mm it's an educated hand thing, countless guys have snapped off sump bolts with torque wrenches and stripped a stud out of the RH exhaust valve cover.