Before & After or New Millstones for my flour mill

In the last weeks I was not satisfied with the flour I milled with my Home flour mill. Could it be that after 10 years often regular use my once second hand bought mill started to decrease? I decided to try an exchange of the mill stones and ordered some replacement in the internet. And already when I unpack the stones I could the that there was huge difference between the new ones and the old ones (The new stone is always on the right side in the picture.) Now I can mill fine flour again.