I was able to restore the diameters of the linkage balls of
both the radius rod arm (above) and the pittman arm (below)
minus .020". With a short bar of steel (at left)and a tube
of valve grinding compound, I hand lapped the link balls to an
even size (whithin .0015" on the diameter).
The bar has a 15/16" drilled hole in the end with tapered bore
out to the largest diameter of the link ball.
It takes a while; about .002 to .003" per hour by hand. It is
faster with the tool in the lathe, but leaves scratches in the