Hi Peter, Good videos to get users started with the 750A drill. Just one thing to note on this video is that once you have entered the weight into the head unit after first calibration, the computer then readjusts the metering speed to correct the discrepancy between the rate achieved and the rate required. At this point if you would like to check that this has happened correctly there is the option to check the calibration with the check calibration button. You do not need to start fiddling with the manual adjuster as you suggest.