I need a bigger prop for my steam tug, it's working fine now but has plenty of torque for more prop, I need either a 3 or 4 blade brass prop with a threaded hole for a 1/8th inch shaft which is a dumas shaft, there 1.75 inch prop is only for 3/16th shaft which the stuffing tube wouldnt fit in the keel of my boat, so if I can find a 1.75 3 blade, or a 1.5-1.75 inch 4 blade for it Id be very happy, the engine is a wilesco dual action and will run either direction at the same speed so rotation is not a concern...a 1.75 4 would be the ideal, it would spin it. during a test run in the tub i could pull it backwards ad a good speed and the engine never slowed...I have the 1.5inch 3 blade at the moment...any help would be greatly appreciated