Hi, i'am new to restoring Tractors.I'am having problems getting oil in my tractor,there is a small fitting on the rear of the valve cover,but the hole in it is so small it will take a funnel with a very small end to get the oil in it.The second problem i can't get the fitting out of the valve cover.Does anyone have any suggestions or has anyone run in to this problem? The Tractor is a 400 Farmall.