Hi I've purchased and fitted a superstar components plasma chain device in my specialized big hit. It makes a terrible noise and I really don't see why. As far as I can see I've set it up correctly with the spacers. There is space either side of the chain in the upper guide but a really nasty noise when pedaling. I presume the noise is from the lower roller as when this is removed the noise is gone. The chain seems well aligned in the device with a 36t chain ring. I can't see where the issue is. The noise sounds like the derailleur is badly out of time but I know it's not. Any ideas would be a great help.