import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-26))
r=w0.sketch().arc((-49,7),(50,-5),(-48,12)).segment((-39,12)).segment((-39,7)).close().assemble().finalize().extrude(33).union(w0.workplane(offset=53/2).moveTo(1,2).cylinder(53,48))