If your trigger pull is smooth now and the trigger is light enough don't worry about working on the connector . Easy to make a light trigger to light or hurt the function of the safety features . Beside I barely get along with a computer . Marking photos cover where to file and polish and send are beyond my ability !Hardluk I am having a difficult time figuring out which part you are saying to polish to reduce the trigger pre travel. Do you happen to have a picture of the part you are referring to?