If you dont have pin style plier, then perhaps build a 'socket' yourself?
Take a thick washer with correct inner diameter, tap two (m2?) screw holes in it, install the 2 screws, and weld on a piece of tube on the washer ?
You can also work with a large nut (think M10-ish), drill lengthwise through it for two screwholes and install two screws. Advantage is that you can fit a normal socket around it, and no need for welding.
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