if you put your hand on the "scope arm" you can see the image .001 or so.
you can see what ".001 or so"??
1986 presetter.. whats the brand? Or is it a modified comparator? There's a substantial improvement in presetters over the last 20 years. Read up on it and go check some out. Parlec, Nikken, Spironi (from Big Kaiser) are some of the big names out there right now. There are many others. Take a walk outside for awhile. You'd be amazed at the accuracies and capabilities they have now.
It's just a part..... cutter still goes round and round....