The head on my Zefal Husky floor pump won't hold an airtight seal between the pump head and a schrader valve or adapter anymore. The Zefal website says there's supposedly a replacement rubber ring available, but I can't find anyone who sells it. So, I either need to find a compatible pump head or hose. Has anyone found a U.S. source for Zefal pump parts, or used/adapted a head or hose from another manufacturer's pump on a Zefal? Let me know.