I had the exact same problem. Used a strap wrench to remove.
I noticed the o-ring seemed too thick and created lots of friction on the face of the extender. I coated the o-ring, mating face of the extender and the latching pins and grooves liberally with plumbers grease. I can now put the extender on and off without help.
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Bob Larson
2018 34J Windsport, 98 Jeep Wrangler
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