import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-17))
r=w0.sketch().arc((39,25),(49,35),(47,48)).close().assemble().finalize().extrude(-16).union(w0.sketch().arc((-49,-24),(-20,-44),(-35,-13)).arc((-45,-15),(-49,-24)).assemble().push([(-27.5,-42.5)]).rect(11,3,mode='s').finalize().extrude(51))