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8UFFER Aero Digest aircraft production aluminum alloy amount angle antimony anvil Aviation bead bend radii blanked blow bolster bolts bottom cast Cincinnati Shaper clamping lugs concave flange contour cutting edge deep draw drop hammer Dural durometer easily eliminate equipment fastened female finished flask flexible tooling form block furnace gang plate gauge hammer head harder HARO heat-treated height hydraulic press inch increase Iron Age KINDELBERGER lead punch lightening holes locating magnesium male Masonite material method necessary notched offset operation piece of rubber pins plaster pattern platen plywood possible pouring power brake practice press load pressure rings prevent radius RECOMMENOEO removed Republic Aviation result retainer block rope rubber pad sand mold scrap shape shear sheet being formed sheet metal sheet-metal shown shrinking spring-back stainless steel stearic acid surface template tensile strength thickness trim V-die Vultee Aircraft width wrinkles zinc alloys