Step
7 - Make your own Dumbbells - Weigh each end
Check the weights as you fill them remember each mold will be one-half the weight of the finished dumbbell! The PVC pipe and bolts is about 1/2 bolt. If you're really OCD, you can weigh again and adjust after putting the pvc pies into the concrete.
One tip: You can cover the top of the scale with kitchen plastic wrap so you don't need to worry about getting concrete or dirt on it.