ORIGINAL: johnboy151a
You could find a known start point and walk off the distance of each screw with a set of Dividers. No different then walking off Rivet pitch on a full scale sheet metal repair.
Just my 2 cents.....
Good idea, except that you need a way to find out what the distance between the screws is first. You could use the string/tape method, followed by the dividers.
James.