import cadquery as cq
w0=cq.Workplane('YZ',origin=(-13,0,0))
r=w0.workplane(offset=3/2).moveTo(-36,-42).cylinder(3,13).union(w0.sketch().segment((-47,-95),(-18,-95)).arc((1,-100),(20,-95)).segment((49,-95)).segment((49,-21)).segment((20,-21)).arc((1,-16),(-18,-21)).segment((-47,-21)).close().assemble().push([(0.5,-58)]).rect(1,36,mode='s').finalize().extrude(16)).union(w0.sketch().arc((-22,53),(-15,43),(-4,36)).segment((-4,35)).segment((1,35)).arc((7,34),(14,35)).segment((19,35)).segment((19,36)).arc((40,67),(19,98)).segment((19,99)).segment((14,99)).arc((7,100),(1,99)).segment((-4,99)).segment((-4,98)).arc((-12,94),(-18,88)).arc((-4,68),(-22,53)).assemble().finalize().extrude(27))