Dehumidifier: Came from my mum's place. Fan stopped working. Tried some oil but it was still too stiff to run properly.
Took out the motor and dismantled it: Loads of black crap inside and the armature had far too much end-float and was fouling the casing.
I guess whatever was used to control that had broken up and got ground down.
Thorough clean of bearings and armature in white spirit, added sufficient plain steel washers at each end to set the end-float to about a mm or so. Lubricated with graphited grease. Works a treat now.
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History is much like an endless waltz: The three beats of war, peace and revolution continue on forever.
However history will change with my coronation - Mariemaia Khushrenada