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How to prolong power cord's life
This may be old news, but I thought it was a worthy suggestion to prolong
the life of any Mac power adapter cord that has the small u-shaped sliding
cord keeper. The idea is useful enough that it might save Apple some
complaints about their shorted-lived cords.
Slide the cord keeper right up to the reinforcement at the male end, as seen
in the image at right. Insert the plug into your Mac. About three inches
from Mac, make a loop and double the cord back on itself and insert the
doubled portion into the cord keeper to maintain the loop. This reinforces
the connection to the computer, holding it at a 90 degree angle from
computer. It also serves as a shock absorber, as the loop will release first
before pulling the cord from the computer.