I think they help, they certainly don't hurt the numbers - especially at speed. It's a preference thing.They look ugly IMO, but are they effective? Any numbers?
You can buy black push pins. I used to have a ton of those.Yes, you can see this plug in goodluck's and my pics, double click mine for large view. Hold scoop against inside screen and mark the nose through hole. Take scoop out and then drill hole. If your scoops don't have holes, you'll have to make your own, just look at the pics to determine that. Also key is the appropriate size drill bit for the plug size, use the same bit for scoop and nose holes, maybe some test holes on something else? These plugs hold snug and solid, not loose at all. Good luck.