Coffee Grinder Internal driver part - updated mode

Much stronger replacement coffee grinder plastic driver part.  Just about all the cylindrical shaped hand cranked coffe grinders you can buy use the same badly designed plastic part to drive the ceramic crusher cone.  I have three of those type grinders since this part keeps failing. This new design replaces those with a much thicker and stronger part that will last much longer.  You may have to sand it down a tiny amount to fit perfectly in some grinders since the grinder cone sizes do vary and this part is designed to fit in tightly so it will not flex outward and fail.  Other improvements are closing the slots up the side for overall rigidity and adding radii on top of the side blocks to decrease stress.  Designed by a real mechanical engineer.