Keith,
It took me a year to accomplish attaching an Ohmmeter to a Facetron. I had to open the “black box” and do a lot of tinkering inside; not recommended. In use, the Ohmmeter needle wobbled a lot. The Tube on Mast bearing was the source of the wobble. I gave up when I realized my hand was causing the bearing to wobble, even though I could not feel it. One would have to place some kind of roller bearings between the mast and the tube to over come the wobble. Also not recommended.
I suggest you use the Facetron as designed. Add the dial indicator if your does not already have one. It is a fine machine and you will grow accustomed to the slight hand pressure that keeps the tube to one side of the wobble.
Best regards,
Dave Woolley”