You may take the diaphragm out and check for the slim possibility that the break in the voice coil wire goes from the terminal to the start of the coil winding. I have had that happen a couple of times and have been able to successfully resolder, but otherwise,
I've never seen the Diamond tweeters offered separately. I can only suggest that you email Usher and ask to buy a replacement diaphragm. Good Luck, Tim
