Hi everyone, i have a late 60s/early 70s Rogers dynasonic snare, when i took off the bottom head and snare frame, below the throw-off, right before the bearing edge on the bottom side, there is a small hole and another one opposite it, again this is on the bottom side of the drum. just wondering if this is original or an extra hole, a friend is borrowing the drum right now but when i get it back next week, i want to sell it, and list it accurately. Thanks