Everything works fine and without any screeching sounds. Only two disapointments was the bag it came with. It is barely big enough to fit the sander. It looks much bigger in the pic, and the way the sheets mount with a spring clip. After how many years you would think there would be a better way. Other than that it does a good job.UPDATE....AFTER A COUPLE OF USES I NOW HAVE THE SQUEAL! PROBABLY WILL HAVE TO RETURN IT.