import cadquery as cq
w0=cq.Workplane('YZ',origin=(42,0,0))
r=w0.workplane(offset=-142/2).cylinder(142,68).union(w0.sketch().arc((-31,-87),(-25,-83),(-23,-89)).arc((79,-47),(68,62)).segment((51,69)).segment((53,75)).arc((-82,42),(-31,-87)).assemble().push([(-2,-23)]).circle(27,mode='s').finalize().extrude(58))