import cadquery as cq
w0=cq.Workplane('YZ',origin=(-18,0,0))
r=w0.workplane(offset=10/2).moveTo(12,7).cylinder(10,17).union(w0.sketch().arc((-24,27),(-28,21),(-21,22)).arc((5,44),(-24,27)).assemble().reset().face(w0.sketch().segment((-6,-45),(17,-50)).segment((26,-12)).segment((10,-8)).segment((10,-10)).segment((6,-10)).segment((6,-7)).segment((2,-6)).close().assemble()).finalize().extrude(36))