A damper assembly for a friction clutch includes a first and second series of springs arranged by a first and second series of spring pockets disposed around the outer circumference of the clutch. The user interface navigates content using a method including displaying a first playlist on the basis of all reproducible pieces of content; receiving at least one content filtering condition; displaying a second playlist according to the received content filtering condition; and receiving a desired content select signal on the basis of the first playlist or the second playlist. The invention also relates to processes for the preparation of compounds of the present invention, pharmaceutical compositions containing the compounds of the present invention and the methods for treating or preventing microbial infections using the compounds of the present invention. The plates are in a state of relative rotation. is greater than 10 mm2s and wherein the amount by weight of the dispersant is greater than the amount by weight of the phosphorus compounds and any sulfur compounds which may optionally be present.