Thee other possible failures apart from failed drum bearings are:
1) The machine supporting feet are incorrectly adjusted leading to either the entire machine bouncing up and down, or the “twist” causing parts of the outer cover to rattle together (especially if on a wobbly floor)
2) Some of the drum support springs and/or dampers have failed. Need to pop the lid or back off for a look. (means drums vibrates excessively, often smashing into the internal stops making a right racket
3) Heavily worn brushes or commutator on the motor – Can cause wining / whiring or clicky sounds at some motor speeds