Can anyone tell me what would be causing one of my rear coil springs on my 960 to rub on the side of the pocket where it rides in the support arm? It creates a very noticable noise as the multi-link suspension moves up and down. I expected to find a break in the spring close to the end which might cause the spring to shift to the side, but everything looks positioned correctly and there is a shiny area which shows where the rubbing occurs.