import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-29,0))
w1=cq.Workplane('ZX',origin=(0,-36,0))
r=w0.sketch().arc((-12,3),(-50,-8),(-10,-9)).arc((4,-25),(26,-27)).segment((38,-30)).segment((41,-16)).arc((45,-6),(46,4)).segment((50,21)).segment((34,24)).arc((5,27),(-12,3)).assemble().finalize().extrude(18).union(w1.workplane(offset=73/2).moveTo(29,-5.5).box(6,27,73))