JUST FOUND TWO LINKS IN ANOTHER POST ON THE ATAL ATAL WITH VERY GOOD INFORMATION TO ADD TO THE REFRENCE. THEY WERE POSTED ON ANOTHER POST BY MARE ROSU .
http://donsmaps.com/atlatl.html AND
http://www.primitive.org/atlstealth.htm
THE ORIGINAL POST IS ON PAGE ONE OF THE POST, SLIDING WEIGHTS ON SWORDS POST.