import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-6,0))
r=w0.sketch().segment((-50,-30),(-18,-30)).segment((-18,-24)).segment((-14,-24)).segment((-14,9)).segment((-50,9)).close().assemble().finalize().extrude(-29).union(w0.sketch().segment((24,-22),(46,-22)).segment((46,-6)).segment((44,-6)).arc((25,29),(24,-11)).close().assemble().push([(30,9)]).circle(16,mode='s').finalize().extrude(41))