Originally Posted by
grumpy
The dome under the flashed aluminum (or aluminum paint) is thin, but hard phenolic. If the dents didn't recover right away, the underlying material has been compromised (fibers broken). They can be made to look better and perhaps the "sound will be unaffected much", but they can't really be fully restored without a NLA dome kit. That said, removing the dome and its holder, and carefully pushing the dents out will likely cause less damage to the aluminum surface. It's a bit tricky to get the dome assembly off without damage (adhered to the magnet assembly), so good to go slow if you decide to do this. There are several pics with these and 044 (somewhat similar) torn apart on this site.