Hi Les.
I'd be happy to upholster your Parker Knoll but alas I am across the Pond!
You can visit Parker Knoll's website and contact them for upholsters in your area here: PK website
I LOVE my PK chairs. One of the first things I bought when I moved across to Maine. Nothing better than to sit inmy Fav Chair and play a tune. We always had them at me Ma's and the chairs and Sofa were re sprung and covered many times over the Years by my Uncle, Sonny (who just happened to be....an Upholsterer!) Hope you get your PK back in shape soon:>)
The PK shanties are shaping up too...lol
Jude