A couple of days ago: Started vacuum cleaner (cannister style) to freshen up living room carpet. Nasty squeal from the carpet head of the vacuum. I figured it was stuff wrapped on the roller brush. Took off the bottom plate and found all kinds of junk, including a few feet of fiber that looked like hair-fine nylon fishline, and a few inches of picture-hanging wire, wrapped in tight at the ends of the roller. Reassembled enough to try starting it. Squeal was the same.
Exposed motor for roller brush. Found I had to pull it out of it's nitch to get at the ends to oil. Dripped in some oil at each end, turned on to work oil in, seemed to fix the squeal for the moment. Reinstalled motor and put belt to brush back on. Turned on. Motor was dead as a doornail. Wires to motor were joined with whatever-you-call-the-twist-on-connectors-like-ballpoint-caps, which were crushed flat after connecting. Cut the wires from the connectors. Got out meter to see if there was power at the wires. Yes. Just before tossing the motor, discovered that I had bumped off the push-button switch on the carpet head. Reconnected wires, motor ran ok. Reinstalled motor. Had a heck of a time getting the now shorter wires, with connectors, positioned where they didn't block the cover plate from fitting. Finally got things assembled. Vacuum works ok at the moment, but I wonder how soon I will have to see if a new motor for the brush is available. Intended to vacuum just after my wife left for work, finished about the time she got home.