Tyson sparring stories?.

[Hank19]

I know that tyson used to let mike williams hit him to the liver 3 times per round to make sure he never got hurt to the body during a real fight. Theres a youtube video of tyson talking about those rounds where he says him and his camp called mike williams the tenderiser due to his job as liver puncher. I also know that tyson used to change the string in his headgear to his "lucky string" and refused to spar mike williams in headgear with the factory string still in.

I've read the same thing.
Mike Williams was brought in specifically just to work Mike's body. I believe Rooney had spoken about this often.
Tyson revealed in his book "Undisputed Truth" that he when he fought James "Quick" Tillis he wanted to go down from his relentless body shots.
Mike admitted that this was a fight he didn't prepare for properly - and it showed in the fact he was unable to stop him. He claims he didn't spar or train as hard and spent more time partying and drinking.

Anyway, the work he did with Williams prepared him for the body punishment he took from Tillis.

I'd love to provide some clear facts about his sparring with Williams but all I can do is paraphrase the information I've read over the years from the internets, books and magazines and radio shows.
To that end, I've heard countless times that Williams did a great job tearing up Tyson's midsection to get him prepped for war.