@withaveeay@simon_brooke Sorry, no magic solutions. It clearly is supposed to come off that way.
So just the usual: leggo spray, banging on it, heavymetal music, swearing and threatening it with a blowtorch or welder.
If the puller already slipped a few times, it's perhaps time to sharpen its fangs. They do get knackered from that. Or the dodgy method: A Jubilee clip around the paws.