Look at the parts diagram Wayne posted. # 27 is the idle metering jet and sounds like what you describe. It screws in the bottom casting and has a slot for a screwdriver to remove or install. Take it easy if you try to remove it its kind of fragile. If the bottom half doesn't have part # 40 in the diagram. Or doesn't have a flat looking plug with a screw driver slot in the bottom between the drain plug and the drain hole its probably the correct one. What looks like a plug realy isn't, it holds the main discharge jet in on some other numbers of carburetors but your # doesn't have the retaining nut. Some have a month and day stamped on the manifold mating surface when built or made. Never noticed a date on the bottoms, sometimes numbers here and there. Is the 5 and 3 side by side or at different spots?
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