M6 nut holder
thingiverse
You need a holder for an M6 nut or hex screw that lets you tighten without needing a spanner. I'm using mine as a bolt holder, but if you swap out the bolt for a nut, it works just fine. Tightening Tool Instructions: First, add some acetone to the hex hole. Then, press the nut or hex head firmly into place.
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