Hairbear is correct. The two shorter bars are the foot end while the two longer bars are the head end. The 4 inch extension can be added to the middle of the head end....if it does not want to fit without a fight you may have the hammock hung to tightly, loosen the suspension and try again. To open and raise up the end cap pass the bar through the loop of shock cord on the middle of the end cap and tighten with the cord lock.
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