I have an American made SQT200MS with the screw on hydraulic filter. I also have a SQT250 MSY that is a Japan made machine that has no external filter. I know the screw on filter on the 200 is a cellulose filter. They last 3-4 times longer then the standard paper filter that you put in your car. Does anyone have a part number and source for this filter? I have purchased them in the past for a fraction of the Mazak cost, but due to a computer problem, I have lost that information.