I picked up a pair of TSW 510 on neighborhood app last week. Aside from the usual foam rot all the speakers checked out except for one blown tweeter, and pushed in domes on both mids and tweeters. I successfully popped the dust covers back out on the mids, but when I tried to vacuum out the dome on the tweeter it blew a hole right through the foil. So now I have 2 useless tweeters, with no diaphragms, or direct replacements available except for one auction site seller. He's asking more than I want to pay. He also has the "B" variant to my "A" variants. Also I've read the TSW tweeters contain ferrofluid. Is this something that would have to be replaced if I were to find a better price on the original tweeters? These seem like nice speakers, and I like to get them going. I just want to keep the total costs under $80. Has anyone successfully upgraded these tweeters with a readily available option?