Just picked up a '66 9 x 13 bop tom for my '67 downbeat kit - wanted the double nounted toms. the new drum seems mostly original, a little greener than my bop set, but also the one batter side hoop is slightly different than all of the others. At the holes for the screws, the metal flange has more of a downard droop versus all others are flat. Anyone seen this before or possibly it's a hoop from another brand?