I’m not sure if the tweeter is glued or screwed on from the back using a bracket. I had a similar model and there was no glue at all, it was just a large thumb screw on the back that held a bracket that bridged the hole. A screw on the back of the tweeter went through the bracket and was held in by a thumb screw. A tidy, firm attachment.
If your tweeter is like mine was then you'll need to remove the ring around the mid-woofer surround on the driver below. Not sure if you need to use heat or if it’s magnetic or what not, then reach inside and unscrew the midwoofer and access the tweeter from the back. Feel around and see if you have a knurled/ribbed nut. Unscrew it, being careful not to drop any moving parts into the speaker body, either the screw or the bracket you’ll never get them out. :D