Pierce,
Welcome to the forum.
Water leaking out the BW port indicates a damaged spider (or some call it a wagon wheel) gasket. Never had to disassemble the handle part of mine but I do see that white disk that they call a non-metallic bearing. For detailed info on this valve you can go to the Hayward website
http://www.haywardnet.com
as they have quite a few on-line diagrams, parts lists, and resources. As I stated it's the internal gasket that is damaged. Replacing this isn't hard and I think they run about $9 or so but I'm probably wrong about that. You'll need the model number of the valve because the gaskets are different. I have generated quite a bit of controversy on this forum about how to replace it. Some, including Hayward unless they changed, recommend crazy glue, others say no glue, I have my own way that has worked great for me for a couple years so far. I'll post details when and if the time comes.
Al