If I'm reading your question correctly, the IH manual refers to that as "where the valve lever contacts the valve stem contact," so it doesn't really have a name. It is not an insert, but that surface is hardened. It will wear, but a machine shop can resurface it, as long as there is enough hardened material there to work with.
As far as getting a blade in there, it needs to be a narrow one, as close to the width of the valve stem as you can manage. The surface of the arm is intentionally cupped -- the valve stem moves in a straight line while the arm moves on an arc, and it's that cup that keeps the pressure on the valve stem straight up and down.
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