import cadquery as cq
w0=cq.Workplane('YZ',origin=(-5,0,0))
r=w0.sketch().push([(12,24)]).circle(10).circle(3,mode='s').finalize().extrude(-42).union(w0.sketch().segment((-50,-1),(-46,-4)).arc((-47,-13),(-43,-22)).segment((-43,-21)).arc((-46,-13),(-45,-5)).segment((-9,-34)).segment((3,-18)).segment((2,-17)).segment((-1,-15)).arc((0,-6),(-4,3)).segment((-4,2)).arc((-1,-6),(-2,-15)).segment((-38,15)).close().assemble().finalize().extrude(-17)).union(w0.sketch().arc((40,-13),(45,-18),(49,-24)).segment((50,-23)).segment((41,-12)).close().assemble().finalize().extrude(52))