import cadquery as cq
w0=cq.Workplane('YZ',origin=(-53,0,0))
w1=cq.Workplane('YZ',origin=(-43,0,0))
r=w0.sketch().segment((-51,-2),(-36,-2)).arc((0,-36),(36,-2)).segment((51,-2)).segment((51,2)).segment((36,2)).arc((0,36),(-36,2)).segment((-51,2)).close().assemble().finalize().extrude(47).union(w0.sketch().segment((-36,-24),(-31,-24)).arc((0,-40),(31,-24)).segment((36,-24)).segment((36,-17)).arc((40,0),(36,17)).segment((36,24)).segment((31,24)).arc((0,40),(-31,24)).segment((-36,24)).segment((-36,17)).arc((-40,0),(-36,-17)).close().assemble().finalize().extrude(153)).union(w1.sketch().circle(21).rect(8,20,mode='s').push([(17,7)]).circle(2,mode='s').finalize().extrude(-57))