Blimey, I don't know what I was on when I commented above. It must have been a bad day. Sorry, muppet mode and rude with it.
Fwiw, I do have one of the Pure Racing i900 things that Superstar sells, it was a bit sticky out of the box, stripping and applying lots of grease helped that, but it kept getting sticky again.
Sorted out with zip-ties and a length of inner tube covering the moving parts and seals, since then it's been fine, though there is a small amount of lateral play, though I don't notice it when riding. Hasn't had much use, but some sort of muck seal makes sense I think.