import cadquery as cq
w0=cq.Workplane('YZ',origin=(35,0,0))
r=w0.sketch().segment((-50,-37),(-16,-37)).arc((44,-32),(21,24)).segment((21,50)).segment((-50,50)).close().assemble().finalize().extrude(-71).union(w0.sketch().push([(22,-22)]).circle(28).reset().face(w0.sketch().segment((20,-41),(24,-41)).segment((24,-35)).arc((35,-22),(24,-9)).segment((24,-3)).segment((20,-3)).segment((20,-9)).arc((9,-22),(20,-35)).close().assemble(),mode='s').finalize().extrude(-50))