I tried again, this time with a home-made "rooster muffler"...a velcro collar. It worked when I finally got it tight enough (I'm a bit cautious)...but I didn't expect it to go so tight, so there wasn't enough velcro holding it on, and it has now loosened it again...I'll try again soon
Could you post a picture for your "rooster muffler" & secured to your Rooster. If this works, you'll make a lot happy - being able to keep a rooster (they are prettier then hens) where prohibited.