Just inboard from the hub, there's a ring-type thing on the driveshaft
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(I'm looking at the offside) It's about 2 inches diameter and half an inch wide, seems to be a rubber inner and a metal ring surrounding that, with more rubber over the top.
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What's it's function?
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On mine it looks a bit knackered, how easy is it to replace? Is it expensive
![Confused :?](./images/smilies/icon_confused.gif)