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Building a Figure-4 Deadfall Trap — Stone Weight Trigger Mechanism
Bob

Autor

Bob

15. maj 2026BE
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Building a Figure-4 Deadfall Trap — Stone Weight Trigger Mechanism

The figure-4 deadfall is one of humanity's earliest mechanical traps — a heavy flat stone balanced on three interlocking sticks carved to form a figure-4 shape. When an animal disturbs the bait stick, the trigger collapses and the stone drops, pinning the animal beneath its weight. Unlike snares that work by restraint, a deadfall kills instantly through impact force. Archaeological and ethnographic evidence shows deadfall traps were used across every inhabited continent from the Upper Palaeolithic onward. The figure-4 mechanism is remarkably elegant: three sticks notched to interlock at precise angles create a structure that is stable enough to hold a heavy stone yet sensitive enough to collapse from the lightest touch on the bait. This blueprint teaches how to carve the three trigger components, assemble the figure-4 mechanism, select and position the deadfall stone, and set the trap on a game trail. The only tools required are a sharp stone blade and patience.
Średniozaawansowany
1-2 hours

Instrukcje

1

Select a Flat, Heavy Deadfall Stone

Find a flat stone weighing 5 to 15 kg depending on target animal size. The stone must be flat on the bottom to distribute weight evenly and heavy enough to pin an animal instantly. Test by lifting — if you struggle with one hand, it is heavy enough for rabbits.

Materiały do tego kroku:

Flat Stone SlabFlat Stone Slab1 sztuka
2

Gather Three Straight Hardwood Sticks

Find three straight, dry hardwood sticks each approximately 20 to 25 cm long and 1.5 to 2 cm thick. Use dead, seasoned wood — green wood flexes under load and the trigger will not hold. Oak, ash, hazel, or birch work well. Avoid softwoods like pine.

Materiały do tego kroku:

Hardwood SaplingHardwood Sapling3 sztuk
3

Carve the Vertical Post (Upright Stick)

Take the first stick. Carve a flat chisel edge at the top end — this rests against the underside of the stone. At the bottom, carve a square notch on one side, about 3 cm from the base. This notch receives the horizontal bait stick.

Tools needed:

Flint KnifeFlint Knife
4

Carve the Diagonal Support (Lever Stick)

Take the second stick. Sharpen one end to a flat chisel point — this presses against the stone's underside at an angle. At the other end, carve a square notch that will interlock with the vertical post. The notch faces downward when the stick angles from stone to ground.

Tools needed:

Flint KnifeFlint Knife
5

Carve the Horizontal Bait Stick (Trigger)

Take the third stick. Carve a square notch near one end that interlocks with the notch on the vertical post. The opposite end holds the bait and extends under the stone. Sharpen this bait end to a point for skewering food.

Tools needed:

Flint KnifeFlint Knife
6

Test-Fit the Three Sticks Without the Stone

Assemble the figure-4 on flat ground. The vertical post stands upright. The diagonal support angles from the top of the post toward the ground. The horizontal bait stick connects at the notch on the vertical post and extends outward. All three notches must interlock snugly.
7

Adjust Notch Depths for Sensitivity

The notches must be deep enough to hold the stone's weight but shallow enough to collapse when the bait stick is disturbed. If the trigger holds too firmly, shave the notches slightly shallower. If it collapses on its own, deepen them. Test repeatedly until the balance is right.

Tools needed:

Flint KnifeFlint Knife
8

Prepare the Bait

Skewer bait onto the pointed end of the horizontal stick. For rabbits, use leafy greens, root vegetables, or fresh herbs. For ground birds, use seeds or berries. For rodents, use nuts or dried fruit. The bait must be firmly attached so the animal tugs the stick rather than stealing the food.
9

Clear a Flat Base Area

Choose a flat, firm patch of ground near the game trail. Clear away loose stones, sticks, and debris from an area slightly larger than the deadfall stone. The stone must land flat against the ground — gaps underneath let the animal escape.
10

Position the Vertical Post

Stand the vertical post upright on the cleared ground. The chisel-point top faces upward toward where the stone edge will rest. The notched end sits at ground level. Press the base slightly into the soil so it does not slide.
11

Lean the Stone Against the Vertical Post

Carefully lean one edge of the flat stone against the chisel point at the top of the vertical post. Hold the stone steady with one hand while you assemble the remaining trigger components with the other. The stone should lean at approximately 45 degrees.
12

Connect the Diagonal Support

While holding the stone, position the diagonal stick so its chisel end presses against the underside of the stone and its notched end interlocks with the top of the vertical post. The diagonal creates a rigid triangle between stone, post, and ground.
13

Insert the Horizontal Bait Stick

Slide the horizontal bait stick into the notch at the base of the vertical post, extending outward beneath the stone. The notch connection is the critical trigger point — when an animal pushes or pulls the bait stick, this joint separates and the entire structure collapses.
14

Release and Test the Set Trap

Slowly release your hold on the stone. The figure-4 mechanism should support the stone's full weight. Gently tap the bait end of the horizontal stick — the trap should collapse instantly, dropping the stone flat to the ground. If it does not, re-adjust the notch depths.
15

Reset and Conceal the Trap

Reassemble the trigger mechanism with the stone in position. Scatter leaves and natural debris lightly around the base to conceal the mechanism, but keep the area directly under the stone clear. The bait must remain visible and accessible while the trigger sticks blend into the surroundings.
16

Mark the Location and Check Daily

Place a distinctive marker — a stack of small stones or a broken branch in a pattern — near the trap so you can find it again. Check the trap at dawn and dusk. Reset after each trigger event whether successful or not. Replace bait daily to keep it fresh and attractive.

Materiały

2

Wymagane narzędzia

1

Materiały z połączonych planów

Required Equipment

Equipment this kind of build typically needs — buy from any maker below.

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Can't get one of the materials? Swap it for an equivalent — these work just as well.

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