In the following video, I demonstrate how to build a simple device to increase the inertia of the wearers fist, allowing the easy destruction of concrete blocks.
Video: .
For this project, you’ll need the following parts:

10″ strap hinge
1′ x 3″ foam core PVC
4″ x 1/2″ PVC
One 5 1/2″ x 1/2″ bolt and nut to fit
Two 1″ x 3/8″ round head Allen screws and lock nuts to fit
Four 1/2″ washers
One 4″ x 3/8″ bolt
One 2″ x 3/8″ bolt and nut to fit

And the following tools:

Drill and bits
Box-end wrenches
Allen wrenches
Sandpaper or bench grinder… more

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