import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,16))
w1=cq.Workplane('XY',origin=(0,0,-4))
r=w0.sketch().arc((32,41),(35,39),(39,38)).segment((39,40)).segment((41,40)).segment((41,39)).arc((42,40),(42,41)).close().assemble().reset().face(w0.sketch().segment((32,47),(42,47)).arc((37,50),(32,47)).assemble()).finalize().extrude(-66).union(w1.sketch().segment((-41,-50),(-24,-50)).segment((-24,-25)).arc((-23,-20),(-24,-16)).segment((-24,9)).segment((-41,9)).segment((-41,-16)).arc((-42,-20),(-41,-25)).close().assemble().finalize().extrude(54))