The grommet held the badge in place. But the B/O badges also had some kind of adhesive backing as well. Why the grommet is missing? I don't know...It is peculiar.
Well...just for the sake of a theory, I could say that the shell was a WorldMax (Chinese-made) shell re-fitted with some authentic Ludwig hardware. The WorldMax shells are very close to the Ludwig shells, but WorldMax drums are far less valuable than Black Beauties. So, if someone was going to fake a Black Beauty, this would be one way to do it. The fact that the grommet is missing could be a red light. I'm not saying it is. I just like making people worry.Burger Kin But seriously, most of the time, grommets are pretty much permanently affixed to the badge/shell. It seems like it would take some doing to get one off. I don't think they just fall off, in other words.
Also, and I may be wrong...but I think WorldMax was/(is?) selling just the raw, un-drilled shells to some builders. I'm not sure if they are available to the general public that way or not.
DON'T USE BRASS CLEANER! It contains an abrasive that will scratch the black chroming and you'll end up with a nice, shiny brass colored drum! Just use something like Windex or a mild detergent and a SOFT cloth.