I have a 2 micron/div Citizen DTI that I would like to mount on a base to be used only on a granite surface plate. Can anyone share some advice on what is the best arrangement for the base ? At the moment I am thinking a relatively heavy cast iron base arranged to balance the weight of the DTI and its support arm with three contact pads each about 30 mm diameter. Not sure about trying to slightly dome the pads, or to scrape them flat. John.