Season 12

Metal housings, motors and hammer mechanisms are assembled into pneumatic impact wrenches, mineral-filled resin is molded and polished into cultured marble sinks, sliced plantains are fried and seasoned into chips, and specialized frames, engines and safety systems are assembled into NASCAR stock cars.

Hydraulic pumps and hardened metal tools are assembled into emergency rescue equipment, plastic foliage is attached to metal frames to make artificial Christmas trees, thin sheets of dough are baked into soda crackers, and gears and locking mechanisms are fitted into ratchet handles.

Calibrated sensing components are enclosed in thermometers, springs and weighing mechanisms are installed in produce scales, aircraft surfaces are prepared and coated with specialized paint, and premium chocolate is molded, filled and decorated by hand.

Precisely machined passages, valves and floats are assembled into carburetors, compressors and heat-exchange components are installed in air-conditioning systems, and harvested sugar crops are processed and refined into crystalline sugar.

Steel blanks are forged, machined and plated into combination wrenches, prepared meats are seasoned, cooked and sliced for delicatessen sale, electric drive systems and molded bodies are assembled into golf cars, and lightweight structures and fabric envelopes are combined into airships.

Layers of carbon fibre are molded and cured into lightweight automotive components, heating elements and blowers are installed in electric hand dryers, discarded plastic is processed and spun into recycled polyester yarn, and synthetic fabric is brushed and finished into fleece.

Metal blanks are stamped, plated and finished into police badges, measured batter is deposited and baked into muffins, automated spraying and brushing systems are assembled for commercial car washes, and pressure-sensitive mechanisms are calibrated inside gauges.

Electronic coils and control circuits are assembled into metal detectors, fermented sugar-cane products are distilled and aged into rum, colored glass is cut and joined into Tiffany-style reproductions, and precision components are manufactured and assembled into aircraft engines.

Engines, cutting decks and controls are assembled into riding lawn mowers, heated kernels expand into popcorn, powered frames and articulated supports are installed in adjustable beds, and laboratory processes reproduce the conditions needed to grow cultured diamonds.

Curved aluminum panels and fitted interiors are assembled into Airstream travel trailers, horseradish roots are cleaned, ground and prepared as a condiment, heavy steel vessels and burner systems are combined into industrial steam boilers, and active ingredients are blended and packaged as deodorant.

Hardened steel shafts are shaped and fitted with handles to make screwdrivers, diesel engines and hydraulic systems are assembled into compact track loaders, calibrated weighing mechanisms are installed in physician scales, and composite materials are layered and cured into carbon fibre baseball bats.

Linked steps, drive chains and safety systems are assembled into escalators, layers of Kevlar fabric and resin are molded into lightweight canoes, cultured goat milk is processed and aged into cheese, and pinned metal discs operate the mechanisms inside disc music boxes.

Precision-machined parts are assembled into motorcycle engines, powdered glass enamel is applied and fused into decorative sculptures, plant fibres are pulped and formed into handmade paper, and layers of composite material are shaped and tested to produce flexible vaulting poles.