Sorry, the laser idea doesn’t appeal to me...first the reference dot is maybe 20’ away. Maybe you young guys can see a dot that far away to within a 1/16” or so...but I would have to run back and forth, bump it, go check, tighten, go check, etc. Also, i’m picturing a simple laser pointer...how it goes in the vice each time could introduce error. Perhaps with a mirror reflecting back to the mill to a local target it could work...not sure you could rely on the mirror to be perfectly stable over temperature, humidity, earthquakes (CA), etc. But if you like this, great.