Kevin McMahon will stage an understated but committed protest when he throws the hammer Friday at the Goodwill Games in Brisbane, Australia...''It took me 13 years to earn this uniform, and I'd like to be proud of it,'' McMahon says. ''How do I know it wasn't made in a sweatshop? I don't feel proud when I'm contributing to a system that exploits the poor.''...McMahon...has researched the issue this summer and wants companies such as Nike, Adidas and Reebok to improve disclosure of factory locations, restitution for past abuses and institution of workers' rights including formation of unions.