A professional who sets up and operates machine to regroove tread surface of pneumatic tires without removing tire from vehicle. Responsibilities include:

• Raises front or rear of vehicle, using hydraulic jack.
• Positions regrooving machine beneath tire and secures in place.
• Measures depth of usable tread rubber, using awl.
• Sets cutting blades of machine to maximum depth consistent with safety.
• Guides blade to cut desired pattern in tread surface as machine automatically revolves tire.
• May groove tires by hand.