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Message: <blockquote data-quote="watsonw" data-source="post: 55457" data-attributes="member: 254">They're identical...........aren't they ?A friend was complaining about a 'THRUMMING' sound his 543 always makes even at the higher speed although it does run and operate well.He wondered if the fact that his machine seems to have a plain washer between the base of the armature and the lower sleeve bearing and not a fibre type as shown in a 541 parts list of 1923/4/5 ?My friends machine was a @ mid 1930's Perivale rebuild ??Can anyone solve the mystery ?Regards, Walter, Newport, Shropshire.</blockquote>