Ok got a question- got one of the drums from Rock today (the other is being drop-shipped from another location) and they're exactly like my originals except for one detail. The center hole seems to have a slight ridge on it while my original does not- it was completely flat. Is it still usable? I'm thinking that the rim won't seat flush on the drum with that ridge being there (it's about 1/16" tall- maybe less) Anyone using these drums have any problems with their rims not mounting right?

Thanks!
David