Step 2Cut the tires
iImage Information

I didn't take pictures of every step because I built this in about an hour. I hope my drawing makes sense. Basically you just lay the tire on the ground, center the barrel on top of the tire and draw around it with a marker. You then take the barrel off. Don't try to cut through the steel belts on the inside of the tire. Drill a couple of holes in the tire instead, then fit a saw through the holes and cut close to the steel belt all the way around until its out. Don't try to cut the circle out that you drew with the marker. Cut close to the steel belt then cut 3 slits from the center of the tire to the line you drew. This will give you a kind of friction bite on the barrel when you insert it into the tire.