import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,56,0))
r=w0.workplane(offset=-111/2).moveTo(40,2).cylinder(111,18).union(w0.sketch().segment((-61,-18),(10,-18)).arc((20,-99),(12,-18)).segment((12,-17)).arc((56,65),(-34,88)).segment((-61,88)).close().assemble().finalize().extrude(-10))