Another shot of a line drawn on another part. This one turned out better. The trick is to hold the sharpee in your fingers with one finger pressed up against the bend-side of the flange, and the tip of the sharpee on the center line. Then you simply drag the finger all the way down until you get to the end of the flange. The quicker you do it the less chance there is of the line "wandering." Make sure you hold you guide finger along the BEND-SIDE of the flange, and not the open end. The reason for this is that the bend side remains a relatvely constant reference line that will not change very much as the part is worked during assembly. The other side of the flange will be deburred, adn metal will be removed from this side, changing its characteristics, as well as the center point along the flange.
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