I got a new set of Lancer 99 cabinets (used but mint ) and I'm moving my speakers into these new cabinets. I"m looking at that L-20 tweeter with that black ring around it and I'd like to know how one goes about removing it???? With no damage to any of it. I guess you have to take that ring off to get to the screws, but how to go about it????? Thanks, Frank