I've tried just about everything, the problem that I have is, I'm Mac's favorite toy. If he isn't with me, he's walking about the house looking for me. He doesn't care much for toys in general especially shreadable toys. The only toys that I have gotten him to interact with are the foraging toys like the wheel, which broke after a month. Now he's got the four drawer forager, which he likes.
He has just started chewing his perch on his playstand, which is incouraging. He had pretty much stopped barbering or over-preening earlier this year and allowed his tail feathers to start coming out beautifully. But when I moved my office to another part of the house and moved our Senegal into the same room with Mac, he started up again. So now I have seperated them to see if that will help.
His wing feathers are so chewed up that my mobile bird groomer will not even trim his wings because she said they are like lace and can see right through them so he wouldn't be able to fly well anyway.
Mac's previous owners didn't clip his wings and even were in the process of training him to fly around their screened in patio and call "HOME MAC" in which Mac would return to his owners outstretched arm. So I'm thinking, maybe he misses flying and is frustrated which is causing the feather chewing. I know he was really attached to his previous owner who died earlier last year.
My wife is at her wits end and has tried everything to get him to stop over-preening, from spraying Mac with aloe juice, chasing him around the house putting straight aloe on his feathers, made numerous shreading toys, tried to make a neck collar, which lasted all of about two seconds. She was looking at spraying him with apple cider vinegar, but I put a stop to that quick fast and in a hurry.