I have bought from e-bay a z-axis ballscrew for the router table I am building. The ballscrew is new and functions perfectly. All good...except...it came without a bearing support. I can find a bearing support that will work but the locking thread appears to be M20 x 1.5. All the locking nuts on all the bearing supports I can find have M20 x 1.0 thread. Does anyone know where I might find a suitable locking nut (or complete bearing support)?