i have a short bellmouth with screen like you morris and had a finer screen install below the main screen. trouble is that there is lots of dust around here and i suspect that that is one of the reasons my plugs keep getting fouled and it sure ain't good fer my new valves and rings. my supplier in abq attempted to make me a pancake which hasn't arrived yet. he said if it doesn't work,i don't have to pay him. now that is great service!