3d meshing a very thin region of a rod

I want to 3d mesh a rod with curved profiles at both ends, but I am not able to mesh the ends of the rods properly leading to element errors which I am not able to solve. Also I want to 2d mesh a cylinder connected to the rod at one end and then link the 3d elements on rod and 2d elements on cylinder. I have attached the model file and also the images of the cross section of rod and cylinder.

Please help me with the same.

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

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