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I have tried to pull one from a live bird, and not only did I pull as hard as i could, the bird drew blood on me, and I have been told you can actually scar the sockets that the flight feathers sit in so a new feather may not come back in....I just wouldnt as it seems to be extremely painful for the bird, and if you want to show a bird, dont clip their wings to begin with and you wont have an issue with it.
I couldn't tell you how many times I've pulled broken wing feathers to encourage new feathers to grow so a bird would be ready to show. I have never had a feather not grow back. I have never heard of a feather not growing back after a broken wing feather was pulled. It's one thing to say "I wouldn't do it" [for what ever reason], it's quite another to say "you DO NOT want to pull a flight feather" as if doing so was known to cause a problem.
That said, it's probably too late for the bird in question to have new wing feathers all the way grown in by July. If you pulled the cut feathers now you'll have new feathers but probably only about 1/2 grown back.
The best way to pull wing feathers is with pliers, they grip the feather better.