Voice coil assembly can be dis-assembled from the back of the tweeter - VERY carefully these are fragile parts. You can then access the dome from the back and push it back into shape- if they have been sitting with dimples for a long time creases may have developed - and they can be very hard to get rid of - sometimes impossible.
Above only of course if your "smooching" suggested above fails to elicit the correct results :-)
Good luck
Peter
Above only of course if your "smooching" suggested above fails to elicit the correct results :-)
Good luck
Peter