Noisey HOH Dryers
Blower bearings were a common problem after a lot of use, I would also lubricate the main tub bearings, idler and motor bearings on a dryer this old if it is to get much use.
Good trick about cleaning the copper slip ring, I have also been soldering the terminals on the little circuit board for over 20 years in the field to get these finicky dryers working properly. I just solder the dryer harness directly onto the board, no need to add extra wire or another connection in the harness.