A method includes placing a ring-shaped bearing on a cylindrically-shaped sidewall in a chamber, the ring-shaped bearing comprising an inner race, an outer race, balls between the inner race and the outer race, and a grease among the balls; rotating the outer race of the ring-shaped bearing while the inner race of the ring-shaped bearing remains stationary relative to the cylindrically-shaped sidewall; heating the ring-shaped bearing; pumping the grease out of the chamber.

There is provided a dispensing device for a welding rod dryer. The dispensing device may include a plurality of chambers configured to receive welding rod dryers; and a connection member provided in each of the plurality of chambers and configured to supply power to the welding dryers; and a door provided at an entrance of each of the plurality of chambers.