tin bender
n.— «Mills was transferred in March 1943 to Norman, Okla., where she began training in sheet metal and welding. Her rate of pay was $96 a month. The Navy was training her to be an aviation metal smith, or “tin bender” as they were called.» —“Days Gone By: Navy provides path for WAVE’s wandering feet” by John Fooks Texarkana Gazette (Texas) July 3, 2005. (source: Double-Tongued Dictionary)
Further reading
While reading Great Expectations (Bookshop|Amazon) by Charles Dickens, a listener in Arlington, Texas, is surprised when one of the characters inherits some money, which Dickens describes as a cool four thousand. Were they really using cool that way...