Picked up a Damon Howatt Balboa, apparently from '68 or '69. Its in good shape but I think the string that came with it is too short. It says 58". In looking how to measure a bow from string groove to string groove following the curve of the limbs and going straight across the handle instead of following it, that way I measure it at 56" to 56.25". How did Howatt measure their bows in that era? Would a 58" or a 56" AMO string be right? The string that came with it is a nice flemish twist but I measure it at 50", I have tried to unwind it some but I am not getting much more length that way.