orenstein OPCareful using a vacuum suction on tweeters, it’s too brutal for tweeters, it works for bass driver dust caps but tweeters are very delicate, I’ve seen the ham-fisted suck the diaphragm/voice coil right out of the tweeter housing.
The suction concept sounds too good to be true
Use a pair of tweezers with a piece of good sticky tape or I’ve even seen warmed up sticky blu-tack work also, stick into the middle and gently work/pull it out the depression, but from your post they sound trashed.
Cheers George