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I got the`15cm/10cm. I'm going to adapt a drive dog into the impeller to mate with the drive dog that comes with the shaft/sleeve. I'm deciding on how to support the impeller end of the shaft. I'll either add a support structure to the water intake part or install a bronze bushing into the fixed stator and have the 4mm shaft slide into that. I may also streamline the reversing cone with a single cup design similar to the attached photo.