Assemble a crutch tip to each hole, bolt from the bottom, through the crutch tip with the fender washer inside the tip bolted to the lumber. Be sure to wash them before bringing them inside after a summer of use outdoors. It's amazing how many spiders and other assorted creepy critters get inside the poles. Use a baby bottle brush attached to a string to clean the inside of the poles. Dish-washing soap in the bath tub works well.
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