Rear wheel arch liner removal - stud spinning

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The rear wheel arch liners are held in place by 1 screw and 4 plastic nuts (#11 here). The nuts screw on to captive studs - 3 of them come off easily but the 4th (in the position arrowed below) doesn't because the stud spins with the nut.

The other end of the stud (it might be a bolt) is hidden and can't be reached to stop it spinning.

Has anyone found a solution to this problem?



I read a post by someone with the same problem last week, now I can't find it again.

Plan A - be patient and wait for ideas.
Plan B - rip the liner off by force.