How do you change belt on sander model 351 225930?

To change the belt on a sander model 351 225930, first, unplug the sander for safety. Remove the cover or housing that protects the belt by unscrewing it, then release the tension on the belt by loosening the tension adjustment knob. Carefully slide the old belt off the pulleys and replace it with a new belt, ensuring it sits properly on the pulleys. Finally, reassemble the cover and plug the sander back in to test it.