This is a modified lever arm http://www.thingiverse.com/thing:296670
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![Lever arm modyfication [V7.0] QU-BD One 3D model preview](https://resize.thingiverse.com/?url=https://cdn.thingiverse.com/renders/b1/a1/74/bd/ed/2014-07-11_22.34.47-2_1024x575.jpg&w=1024&h=1024&fit=contain&cbg=white&n=-1)