Wrench Ratings

(Mechanical Aptitude Scale of one to five wrenches)

Can gas up vehicle without spilling too much.

Can service and do minor rig maintenance such as spark plug replacement and oil changes. Can follow directions.

Can perform moderately technical mechanical repairs like brake work and removing cylinder heads. Some
electrical know-how necessary.

Can rebuild engines, manual trans and carbs. Some welding and fabrication skills needed. Must be an electrical wizard.

A one-man factory with all the skills above. Has advanced welding and fabrication skills. Capable of rebuilding any component, including auto trans.