replacement parts

My shaft Broke .. not on the engine but to the pulley .. I'm finding it impossible to replace that shaft or the whole transmission ... grrrrrr??!!! Plz e-mail me if you know where I could buy one.. ? Windsorbratt40@gmail.com

I need a spare! Anyone know where I could go to shop for something like this? Hopefully my description was enough. It would be nice if replacement parts were more readily available... Thanks, -Michael