import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-13))
r=w0.sketch().segment((-17,-5),(-16,-5)).arc((11,-28),(38,-5)).segment((39,-5)).segment((39,3)).segment((38,3)).arc((11,26),(-16,3)).segment((-17,3)).close().assemble().finalize().extrude(-11).union(w0.sketch().push([(-19,15)]).circle(31).push([(37,-33)]).circle(13).finalize().extrude(37))