Might help if one furnished a measure from the lowest to highest detents. Then one can do the math.
It's a VERNIER, and it's laid out like any and ALL vernier scales.
The marks on that staff have NOTHING to do with yardage.
GTC
Member, Clan of the Border Rats -- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain
