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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,51))
r=w0.sketch().segment((-100,-8),(-93,-8)).segment((-93,-32)).segment((93,-32)).segment((93,-8)).segment((100,-8)).segment((100,8)).segment((93,8)).segment((93,32)).segment((-93,32)).segment((-93,8)).segment((-100,8)).close().assemble().push([(-15,-21)]).circle(9,mode='s').finalize().extrude(-103)