Small vice
thingiverse
А small vise with jaw size 30 mm. To assemble: 1) place bolt1 in a vise 2) сlip the bolt1 through the slot in the vise 3) tighten the bolt1 to mount the moving part 4) tighten bolt2 UPD: in v2 change offset of bolts and parts.Should be not so tight
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