"Jeff Wisnia" wrote in message
...
snip-----

The runout written on the line for "master pinion" was less than the one
for "any pinions".

Those of us that work with soft jaws are well acquainted with that. Using
anything but the same socket when tightening the chuck will generally cost
you the .0005" concentricity that is almost guaranteed with soft jaws that
are properly machined. Truth is, with soft jaws, it makes no difference
which socket is selected, so long as the same one is used at all times with
the particular setup.

Some three jaws have a single line next to the "best" socket. Others have
nothing, and some have but one socket.

Harold