They will be dickered in all likelyness even if you do manage to work them loose, but hey they are quite cheap. If you cut through the collars the balls fall out (or you can tap them out) and you can uncouple them.
Blunt chisel to knock the coller up or down with some oil or penetrating fluid, they’re push pull couplings therefore will release either way. They’ll move slowly and steadily
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