import cadquery as cq
w0=cq.Workplane('YZ',origin=(6,0,0))
r=w0.sketch().arc((25,-8),(7,-28),(33,-23)).arc((48,-5),(25,-8)).assemble().finalize().extrude(-42).union(w0.workplane(offset=31/2).moveTo(-25,9).cylinder(31,25))