Pretty Good Postal Scale from Old CDs

Step 2 Prepare finish nails

Two finish nails will be needed as axles. First they will be used as drill bits to make holes that fit them as axles very precisely. In order to make the drill chuck hold them, it will be necessary to remove the heads from the finish nails. You could cut them off. I am grinding them off with a power grinder while the finish nail is spun in a handheld electric drill.