Try using a strapwrench, which is a piece of nylon or cloth webbing to wrap around the tubing without scratching it. It has a metal arm which gives it the leverage for turning. It is not a very popular item, but you might find it in a hardware store or have them order it for you.
By the way I have received my stands and QS 8's. The stands are very well built in my opionion. Maybe you have the problem resolved by now.
Tim