I bought my wife a set of Perfex Mills for Christmas based on different reviews I saw on the net. The problem is despite my attempts to adjust the nut on the bottom, the mill does not grind. If I screw it too tight- nothing, too loose and a few flakes for a lot of work. Has anyone else had a similar issue? Can you disassemble the whole thing and reallign things inside? If so, what am I looking to re-set? Thanks for any advice.