Season 4 begins with Cowboy asking Eugene and Spencer to fortify his compound in preparation for the end days. Included: The guys construct a wood still to make sure that their neighbor will have fuel no matter what.

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Cowboy convinces Eugene and Spencer to embark on an expedition for gold, but they encounter an interloper who threatens to steal their treasure.

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Eugene and Spencer decide to build a solar-powered hot water heater out of salvaged pipes and old beer cans, but first they need to construct a chainsaw chopper for their friend who has the supplies they need.

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The guys hunt for treasure using a metal detector made by Eugene out of bamboo, wire scraps and a salvaged transistor radio.

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The guys rid a friend's home of honeybees and decide to start their own honey-making business.

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The guys build a wood kiln out of discarded oil barrels and a huge outdoor rotisserie for cooking chickens.

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Eugene and Spencer build a trickle-feed irrigation system using bamboo and some scrap metal in hopes of resolving a water feud that is threatening Cowboy's crops.

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The guys transform a herb-drying shed into a guesthouse cabin for Spencer's visiting mother-in-law.

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When Eugene breaks his mom's rare burl wood bowl, he and Spencer must cut down a giant burl, forge woodworking tools from scrap metal, and repair an old truck just to use the axle as a wood lathe, for turning their burl into a new bowl for Mama Gene.

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A creek blocks the best route from Cowboy's house to the holler, so Eugene and Spencer build an old fashion swinging bridge from scavenged rope and hand-hewn bamboo. Will their hillbilly rope bridge hold weight? Or will it dump the boys in the drink?

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Eugene and Spencer aim to clear an overgrown field and find a valuable item Cowboy hid there years ago. But their hand-made brush axes can't cut the dense growth, so the boys build a brush hog out of Cowboy's old truck and a couple of used lawn mowers.

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The boys must come up with a contraption that can help notorious old moonshiner, Charlie Shine, bring heavy supplies to and from his hidden still. They'll construct a mechanical cable climber to take the load off Charlie.

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Eugene and Spencer salvage a rusted-solid Winchester M37 and an antique hit and miss diesel engine from a barn full of scrap. They must make an electrolysis bath to strip the rust off the shotgun, which they'll trade for parts to restore the engine.

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Spencer and Eugene set out to build a fish farm. But when they can't afford the cattle-watering troughs where they planed to put their trout, can they rig up their own fish tanks from nothing but a roll of plastic tarp and some old hay bales instead?

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Widowed Mavis has doctor appointments to keep, and a stalled car. If the boys make a tire patch, a replacement gasket and a temporary fan belt out of junk, then they get an old alternator from a junkyard, they might get Mavis to the doctor on time.

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Spencer and Eugene have two days to forge 15 knives for a collector. The boys construct a water wheel to power a homemade hydro-powered grinder—and to power an electric light. Because if they want to meet that deadline, they must pull an all-nighter.

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Spencer and Eugene must build their own hillbilly houseboat, out of a discarded camping trailer, which they float on a pontoon platform made with rows of airtight oil drums, when Cheyenne gets a leisure boat and becomes a bit too big for his britches.

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Eugene and Spencer plan to build wood-burning stoves out of steel barrels, with windows made of high-quality block mica. Can they also build a hand-powered pump trolley out of junkyard scraps for bringing heavy sacks of mica down from the mountains?

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Spencer and Eugene must build a barn wood display case for Cheyenne's store. But to get the wood they must make traps to catch a critter, to make into groundhog grease, to trade for a dog, which they can trade for barn wood to finally make the case.

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Mama Gene steps in a gopher hole and breaks her foot, leaving her homebound on the porch. She's plagued by insects, and missing out on the 4th of July festivities. So the boys build her a flame roasting bug zapper, and a hillbilly ninja rocket wheel.

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Eugene and Spencer run out of vintage high carbon steel, for forging knives to fill an important order. Can they build a salvage barge from junk, to seek a lost sawmill in an abandoned underwater town, and retrieve the old steel that was left behind?

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Eugene and Spencer need to turn a riding mower engine into an outboard motor strong enough to power a salvage barge. The boys want it to locate a lost sawmill in an abandoned underwater town, where they hope to retrieve any vintage steel left behind.

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