import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-100,0))
r=w0.workplane(offset=61/2).moveTo(0,34).cylinder(61,39).union(w0.sketch().segment((-28,-73),(28,-73)).segment((28,-5)).arc((0,-14),(-28,-5)).close().assemble().finalize().extrude(200))