Push the Bushing out of the Endbell, then Lap on some fine sandpaper the Flat
side of the Bushing that the shims run against. Usually it take's a few .001's off to get the Arm to center.
I don't bother to polish the Bushing Face, because the Shims will do it themselves in a few minutes.
Ahhh "The Teacher" becomes the Student.
In a 4wd TC, Trinity Red Springs on both ends for a little more Torque.
I have not found a Brush to work better than the 'Putnams' and they're easy on the Com too.
Try Green +
and Blue's -
Green/Green if you don't mind cutting the Com a little more often.