Hope XD drivers are undersized at the clamp location and not technically in the XD standard spec. Due to this, a shim is required to ensure the cassette clamp functions properly. Please see the cassette section of our support site for install instructions.
New cassettes with the clamp attachment include a shim kit in the box.. don't throw it out!
Please contact your local distributor or e*thirteen directly and we will supply one free of charge.