Oh god--ok, you found it didn't you?, sorry shouldn't ask thing like that. On the later DT175's we had special v shaped rubber ring supplied to stop the clutch rattle at idle. rattle from the drum moving on the built in cush rubber i suppose and/or making it chatter on the clutch drum teeth to the crank gear [something like that]. The heavy rubber ring got stretched over the drum & fitted tightly at the top between the drum & the gear effectively damping the rattle out, worked too.