An overview of the trigger.
PLEASE NOTE: this example is not
necessarily an ideal one. I made it simply to show the concept.
To make this type of Figure-4 trigger, you need to use a type of
wood that does not crack apart easily, one that holds together when
bent. I chose a maple sapling for these reasons. Maple tends to
facture and splinter, but to hold together very well. Try breaking a
maple branch in two and you'll see this effect.
In my trial run here, the hand represents the weight of a
deadfall pressing down.
The bait is placed on the lower end.
I found this particular example to not be strong enough, as I had
cracked the sapling at the outer edge (at the left in the photo),
thus reducing the "spring" of the trigger.