In 1963-65 my parents operated such a garage in the Charlotte area as a second income business. A radio DJ/friend ran it during the day, then they ran it in the evening after regular work hours. Some interesting stories.... keeping up with loaned-out tools chief among them. We stopped by a few years ago when passing through town. The building across the street was still there, but their building was now just an auxilliary parking lot for... the Carolina Panthers stadium.