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Nef-
Same fit for both Hario and Porlex, this is the one I have: https://www.shapeways.com/model/2046168/motor-screwdriver-bit-for-coffee-grinder-msb-p.html?materialId=23&li=ostatus
mmccarthy
Have made sure not to go too fast with it! I'm sure hand grinders weren't designed to handle 1,300rpm! Tend to keep it at something more like 1.3...