How to Build a 12Volt Portable Generator | Sciencing
You can generally accomplish this step using a 5/8-inch-by-3-inch washer that are about 3/16 inch thick, an electric drill, a 1/4-inch thread tap, a drill bit and four sets of 1/4-inch-by-1-1/2-inch to 2-1/2-inch bolts, nuts and lock washers. The blades for the wind generator are repurposed from a vehicle fan clutch.
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