import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,19))
r=w0.sketch().arc((-5,-15),(4,-7),(15,-12)).arc((1,15),(-5,-15)).assemble().finalize().extrude(-39).union(w0.sketch().push([(-31,-17)]).circle(19).push([(34,20)]).circle(16).finalize().extrude(-19))