Instead of that, I usually wrap the cord around the post once or twice...which provides strain relief quite well without requiring any additional stuff.
I just attended the electrical seminar at Fawcetts (given by the contractor who repaired the lightning damage on Glory).
He showed several examples of shore power connectors much worse than Spirit's. He stated the cause as poor (read loose) mechinical contact on the M/F connector union. He said not to rely on the little ring to maintain contact, but to add stress relief in the cord (both on the dock and boat side) and secure the cord with a short length of line to prevent the cord from coming loose during tide changes, wakes from passing boats, etc.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.