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• The drill jig shown in Figure was built from a U-shaped, premachined cast-iron section and a flat section. It was built in 9.5 hours with a savings of 30% in build time. Drill jig made from a standard U-section • The drill jig shown in Figure 5-18 was built from standard structural form materials. It consists of two pieces of angle iron welded to a channel iron to form a V-section. A larger angle iron was welded over the V-section to serve as a bushing plate and clamping mount. The addition of a standard thumbscrew, drill bushing, and section of rod completed the assembly.