I understand your disappointment. What is the width of the button? If it is thick enough, you could drill it?I'm thinking I can possibly fix it, using a tiny, tiny drill bit as a saw, to open it up from the button end. I'm also afraid that I could really mess it up. I also kind of feel that, even after a bit of work, I'd still have a pipe with an eighth-inch draw, so I don't know what to do. I've never returned a product to a manufacturer in my life, and I don't really want to start now, but I am quite disappointed.
I would gladly do it for you just for the cost of of the shipping back if you trust me enough.