import cadquery as cq
w0=cq.Workplane('YZ',origin=(-16,0,0))
r=w0.sketch().push([(-21,51)]).circle(49).push([(-25,43)]).circle(36,mode='s').finalize().extrude(-68).union(w0.sketch().segment((-42,-100),(70,-100)).segment((70,-58)).arc((65,-53),(62,-48)).segment((-42,-48)).close().assemble().finalize().extrude(100))