I'm so sorry to hear about Danny.
I had the no-crow collar on my 10 week old Easter Egger cockerel, Uncle Sam, for seven days. Each morning he managed to crow. He turned 11 weeks old on Sunday morning, he crowed, my neighbor complained and he was killed that day. Roosters are illegal where I live, and the collar was my last resort. Re-homing wasn't a solution for me as well. Roosters are illegal not just in my city, but in my county and neighboring counties as well. And cock fighting is prominent where I live. I used to volunteer at my local animal shelter, and we received a lot of roosters from cock fights and the vet killed them and we gave them to the zoo. Realistically, I knew this would most likely be his fate. Having one rooster to six hens probably would not have turned out well, but I had to try. I feel bad, I consider my chickens as pets not livestock, but I come from a family of farmers who think I'm nuts because I pet them. Both my grandma and dad offered to kill him, and my dad ended up helping me do the deed. I have the feeling it did not work because I had an eight-inch collar, which is the correct size for an adult rooster, but probably to big for an 11 week old cockerel. I tried to make it tight, by Saturday I could NOT get my pinky between the collar and his neck. It just seems like a waste of a life, he was so small, but my dog and cats seemed to enjoy him.
Best luck to everyone else who tries to use the collar.