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6 mm hex head cap screw, two washers, split lock washer, and nut.
Clamp the washers together, and file, sand, grind a flat on their sides deep enough to fit properly onto your terminal connector. If you're patient and handy enough, you can bend up the orthogonal sides of one of the washers to make a saddle for the screw head so it can't rotate while you tighten the nut.
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