import cadquery as cq
w0=cq.Workplane('YZ',origin=(-27,0,0))
r=w0.sketch().push([(25,-8)]).circle(4).push([(24,-5)]).circle(1,mode='s').finalize().extrude(20).union(w0.sketch().arc((21,-33),(50,-8),(21,17)).segment((21,11)).arc((-50,0),(21,-11)).close().assemble().finalize().extrude(54))