I wasted a couple of hours of my weekend attempting to free mine off then decided that my time was worth more than any savings made by reusing it. I got a pleasant surprise when I ordered a new one... there were two different couplings for my trailer, and the correct coupling was the cheaper of the two, then the trailer company I ordered from were running a 10% off voucher code, so I got a brand new coupling delivered for less than Β£180.
#smuglittleginge