import cadquery as cq
w0=cq.Workplane('YZ',origin=(3,0,0))
r=w0.sketch().segment((-50,-5),(-30,6)).segment((-30,25)).segment((-50,25)).close().assemble().reset().face(w0.sketch().arc((-1,-3),(5,-6),(10,-4)).arc((49,-11),(16,10)).segment((16,19)).segment((-1,19)).segment((-1,1)).segment((11,1)).arc((10,-1),(10,-3)).close().assemble()).push([(8,10)]).circle(2,mode='s').finalize().extrude(-6)