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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-20))
r=w0.sketch().circle(90).push([(75,-29)]).rect(12,20,mode='s').finalize().extrude(13).union(w0.sketch().segment((-73,-85),(-53,-85)).arc((0,-100),(53,-85)).segment((73,-85)).segment((73,-68)).arc((100,0),(73,68)).segment((73,85)).segment((53,85)).arc((0,100),(-53,85)).segment((-73,85)).segment((-73,68)).arc((-100,0),(-73,-68)).close().assemble().finalize().extrude(41))