General Motors Fort Wayne Assembly Global Customer Audit Operator Donald Zumstein uses a hand-held tool - called a gap stick - to ensure precise, consistent fits between the hood and frame on a next-generation 2014 Chevrolet Silverado LD pickups in Fort Wayne, Indiana. The plastic gap stick comes in a variety of engineering-specific sizes to ensure exact measurements along the full-size pickups' exterior panels. (Photo by John F. Martin for General Motors)