Alloy 2 had a good explanation of the bind that takes place between the bottom of the bolt head and the mounting surface.
If you can relieve that tension somehow ?
Rightie tightie .... lefty loosie ?
It's hard to tell exactly but it looks like you could take a punch -or- cold chisel to the side of the bolt head and drive the bolt 1/4 turn counterclockwise to relieve the strain ?
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