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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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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