I've begun machining a part which will replace the indicator knob with a toothed pulley on the mill. I am using a piece of steel that was used as a counterbalance weight in an x-ray machine as my source material.  I could glue the toothed pulley in place of the indicator wheel, but then I would not be able to use it as a manual machine. I prefer to keep that capability in case I have computer issues or some other failure causing it to not work. Then I can still make parts on it.