The typical Figure-4 trigger mechanism requires some fancy
knife work to construct. Dovetails and slots must be cut into the sticks at
exact angles. These angles are sometimes hard to line up.
But having constructed the trap, it seems as though a knife
is essential to making it. Not so! In fact, once you've made a figure-4
trigger without a knife, it seems almost simplistic in comparison.
Here are photos of a "no-knife" Figure-4 deadfall
Trap and photos by Walter Muma