Hey there b-limo,
I went thru this with my Kef Reference 104/2's recently, so I thought I'd add my two cents' worth. First, kudos to you brave diy'ers, I hope you all succeed. I took my Kefs to a trusted repair guy and he told me the ferrofluid had dried up - then led me to Midwest Speaker Repair for a pair of new tweeters, which supposedly have specs close to the original, and some say sound better. They were $60 each, I had them installed and the sound is really good. (Had to also rebuild the woofers, common with this mid-80s model).
I went thru this with my Kef Reference 104/2's recently, so I thought I'd add my two cents' worth. First, kudos to you brave diy'ers, I hope you all succeed. I took my Kefs to a trusted repair guy and he told me the ferrofluid had dried up - then led me to Midwest Speaker Repair for a pair of new tweeters, which supposedly have specs close to the original, and some say sound better. They were $60 each, I had them installed and the sound is really good. (Had to also rebuild the woofers, common with this mid-80s model).