Rocker Wear

["CLIFF DAVIES" <c_davies@sympatico.ca>]

Getting my 6 ready for spring, still snow on the ground here in Montreal, I
removed my rocker shaft to inspect it and found that some of the rockers are
worn where I can feel a noticeable wear by dragging my fingernail over the
wear areas. Some are worse than others. How does one know  when a rocker needs
to be replaced. Someone told me to grind down a 10 thou feeler so that it
would fit in the wear area of the questionable rockers when adjusting ?
Any help would be appreciated.
Cliff
73 TR6