tweeter replacement, original glued in


I've an old pair of Michael Green monitors with a VIFA tweeter that a troglodyte burned.  I tried removing the tweeter by unscrewing the 4 and tapping out.  Seems now that the whole thing is glued in.  Any great ideas for tearing this out without destroying the cabinet face and mounting surface?  Thank you in advance.
celtic66
I like the hairdryer idea.  I'll try it.  Just do not understand why it is glued.  Never run into this and I've modified/repaired a dozen pair of speakers.  

I only found the complete tweeter and ordered two and that's okay as I don't know if there is some damage to the other one.  Thanks all.
I'll try it.  Just do not understand why it is glued.


Probably the builder was worried about maintaining an air-tight seal. A little overkill. :)

Thank you everyone for advice.  Ended up going Jeremy Clarkson on it, grabbing the center ring with tweeter core removed with plumber's wrench and yanking it!  Out it all came.  Yes, it was glued.  New tweeter soldered in and done.