I dented the dome on one of my Seas metal dome tweeters. I removed the tweeter baffle and rubbed out the dent from behind with a Popsicle stick that had soaked in water for a while to make it softer. The dent is still slightly noticeable at very close inspection, but appears just fine from a distance. A soft dome should be just as easy, just forget the water on the stick.
BTW, are you interested in selling your F-44 preamp?
BTW, are you interested in selling your F-44 preamp?