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I don't understand the need to calibrate the tool. I made a copy of this tool several years back and I use it as follows. I put he tool into a collet lock it and snug it up. I then lower the head until the indicators are both firmly touching the mill table. I then set the dial on each indicator to zero. I carefully rotate the indicator 180 deg and note the readings. If both are reading zero, the mill tram is OK. To adjust the tram if it is out, I note the readings and adjust by 1/2 the difference in readings. May takes me couple iterations to get it spot on. Basically the same procedure as adjusting a surveying level. Rick
Pictures please!!! something like that would be nice on the Aciera F1Dave
Oh, and I ordered it online, Edge Pro themselves sell it on Amazon, shipping from the factory, for a few bucks less for shipping cost than ordering it direct from the factory website. Price for the unit itself was the same, but total was a little less. Go figure!