I have a few questions regarding poultry blinders, "perfect peepers" or whatever they're called. 1. Do they hurt the bird? The ones I've seen look like they pierce the nasal cavity. 2. How well do they stay on? 3. Would it prevent cocks from fighting? (that'd be soooo great) 4. Does it damage the nostral at all? I'd be using these on show quality cockerels. I don't want to ruin my birds' condition. 5. What's the best brand? 6. Do they come in a bantam size?